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Full vulnerability report · 2026
CVE-2026-83518High confidence

RPC Runtime Elevation of Privilege Vulnerability

Microsoft · Windows 11 version 23H2

7.8HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Medium, lowered one band.downgradedsince 13 Oct 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.39% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Microsoft Windows 11 version 23H2 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
msrc_CVE-2026-83518 · CSAF 2.0 · revision 2 · finalMicrosoft Security Response CenterRPC Runtime Elevation of Privilege Vulnerability
8 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • Windows 11 Version 26H1 for ARM64-based Systems <10.0.28000.2954
  • Windows 11 version 26H1 for x64-based Systems <10.0.28000.2954
  • Windows 11 Version 25H2 for x64-based Systems <10.0.26200.9445
  • Windows 11 Version 25H2 for ARM64-based Systems <10.0.26200.9445
  • Windows 11 Version 24H2 for x64-based Systems <10.0.26100.9445
  • Windows 11 Version 24H2 for ARM64-based Systems <10.0.26100.9445
  • Windows 11 Version 23H2 for x64-based Systems <10.0.22631.7582
  • Windows 11 Version 23H2 for ARM64-based Systems <10.0.22631.7582
Summary
Microsoft
Remediation
10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-99299

No EUVD known-exploited evidence

Heap-based buffer overflow in RPC Runtime allows an authorized attacker to elevate privileges locally.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
7.8 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

Heap-based buffer overflow in RPC Runtime allows an authorized attacker to elevate privileges locally.

What

Heap-based buffer overflow in RPC Runtime allows an authorized attacker to elevate privileges locally.

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

What

Heap-based buffer overflow in RPC Runtime allows an authorized attacker to elevate privileges locally.

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Heap-based Buffer Overflow → gain additional privileges
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-122 ↗

CWE-122: Heap-based Buffer Overflow. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
Privilege escalationCWE-122
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-99299Official EUVD mapping

Heap-based buffer overflow in RPC Runtime allows an authorized attacker to elevate privileges locally.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3892Microsoft Windows und Windows Server: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows Server und Microsoft Windows ausnutzen, um seine Privilegien auf administrative Rechte zu erhöhen, um beliebigen Code auszuführen, um Informationen offenzulegen, um einen Denial of Service herbeizuführen, um den Benutzer zu täuschen und andere, nicht näher spezifizierte Auswirkungen zu verursachen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1314Avis du CERT-FR

6-83508 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83509 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83510 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83511 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83513 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83514 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83515 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83516 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83517 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83518 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83519 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83521 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83522 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83523 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83564 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83565 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83566 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83567 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-202

Official advisory ↗
CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-25Aggiornamenti Mensili Microsoft

nuova finestra - - CVE-2026-83509 : apre una nuova finestra - - CVE-2026-83860 : apre una nuova finestra - - CVE-2026-83866 : apre una nuova finestra - - CVE-2026-83746 : apre una nuova finestra - - CVE-2026-83867 : apre una nuova finestra - - CVE-2026-83868 : apre una nuova finestra - - CVE-2026-83740 : apre una nuova finestra - - CVE-2026-83861 : apre una nuova finestra - - CVE-2026-83741 : apre una nuova finestra - - CVE-2026-83862 : apre una nuova finestra - - CVE-2026-83863 : apre una nuova finestra - - CVE-2026-83517 : apre una nuova finestra - - CVE-2026-83638 : apre una nuova finestra - - CVE-2026-83759 : apre una nuova finestra - - CVE-2026-83518 : apre una nuova finestra - - CVE-2026-83639 : apre una nuova finestra - - CVE-2026-83519 : apre una nuova finestra - - CVE-2026-83750 : apre una nuova finestra - - CVE-2026-83871 : apre una nuova finestra - - CVE-2026-83513 : apre una nuova finestra - - CVE-2026-83634 : apre una nuova finestra - - CVE-2026-83876 : apre una nuova finestra - - CVE-2026-83514 : apre una nuova finestra - - CVE-2026-83635 : apre una nuova finestra - - CVE-2026-83756 : apre una nuova finestra - - CVE-2026-83877 : apre una nuova finestra - - CVE-2026-83757 : apre una nuova finestra - - CVE-2026-83516 : apre una nuova finestra - - CVE-2026-83637 : apre una nuova fi

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6991MS 10월 보안 위협에 따른 정기 보안 업데이트 권고

약성 | | Windows Server Update Service | CVE-2026-81969 | Windows Server Update Service 권한 상승 취약성 | | Windows Server Update Service | CVE-2026-83499 | Windows Server Update Service 권한 상승 취약성 | | Windows BitLocker | CVE-2026-83500 | Windows BitLocker 보안 기능 우회 취약성 | | Windows SmartScreen | CVE-2026-83504 | Windows SmartScreen 정보 유출 취약성 | | Windows Setup Files Cleanup | CVE-2026-83510 | Windows Setup Files Cleanup 권한 상승 취약성 | | RPC Runtime | CVE-2026-83515 | RPC Runtime 정보 유출 취약성 | | Windows Local Security Authority Subsystem Service (LSASS) | CVE-2026-83516 | Windows Local Security Authority Subsystem Service (LSASS) 서비스 거부 취약성 | | RPC Runtime | CVE-2026-83518 | RPC Runtime 권한 상승 취약성 | | Windows IKE Extension | CVE-2026-83521 | Windows IKE Extension 정보 유출 취약성 | | HID Parser Library | CVE-2026-83569 | HID Parser Library 권한 상승 취약성 | | Windows Audio Service | CVE-2026-83571 | Windows Audio Service 정보 유출 취약성 | | Microsoft Windows Search Component | CVE-2026-83575 | Windows Search Service 권한 상승 취약성 | | Windows PowerShell | CVE-2026-83578 | Microsoft PowerShell 원격 코드 실행 취약성 | | Windows Client-Side Caching (CSC) Service | CVE-2026-83580 | Windows Client-Side Caching (CSC) Service 권한 상승 취약성 | | Windows Geotag Broker | CVE-2026-83583 | Windows Geotag Broker 권한 상승 취약성 | | Windows Smart Card | CVE-2026-83584

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
Official vendor articles3 stored documents

Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.

04

Evidence and provenance

Published 13 Oct 2026 · Last source change 28 Oct 2026, 18:11 UTC · CWE-122 · Heap-based Buffer Overflow

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-10-14
European sourceENISA EUVD · EUVD-2026-99299
Product sourceVendor CSAF · Microsoft Security Response Center
Remediation sourceVendor CSAF · Microsoft Security Response Center
CWE sourceOther authority
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  3. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  4. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  6. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  7. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  8. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  9. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  10. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  11. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  12. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  13. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  14. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  15. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  16. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  17. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  18. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  19. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  20. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  21. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  22. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  23. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  24. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  25. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  26. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  27. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  28. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  29. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  30. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  31. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  32. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  33. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  34. Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-83518; removed remediation: msrc.microsoft.com/CVE-2026-83518.
    Before
    patch: msrc.microsoft.com/CVE-2026-83518 · remediation: msrc.microsoft.com/CVE-2026-83518
    After
    no authoritative guidance recorded
    CNA ↗
  35. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  36. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  37. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25.
    Before
    remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25
    After
    no authoritative guidance recorded
    CNA ↗
  38. Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
    Before
    Mitigation available
    After
    Awaiting fix
    CNA ↗
  39. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25.
    Before
    remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25
    After
    no authoritative guidance recorded
    CNA ↗
  40. Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
    Before
    Mitigation available
    After
    Awaiting fix
    CNA ↗
  41. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Microsoft Security Response Center ↗
  42. Affected versionsThe structured affected or fixed version information changed.
    Before
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954 · Fixed: 10.0.26200.9445:Security Update:https://support.microsoft.com/help/5124008
    Microsoft Security Response Center ↗
  43. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    Microsoft Security Response Center ↗
  44. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25.
    Before
    remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25
    After
    no authoritative guidance recorded
    CNA ↗
  45. Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
    Before
    Mitigation available
    After
    Awaiting fix
    CNA ↗
  46. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25.
    Before
    remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25
    After
    no authoritative guidance recorded
    CNA ↗
  47. Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
    Before
    Mitigation available
    After
    Awaiting fix
    CNA ↗
  48. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25.
    Before
    remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25
    After
    no authoritative guidance recorded
    CNA ↗
  49. Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
    Before
    Mitigation available
    After
    Awaiting fix
    CNA ↗
  50. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25.
    Before
    remediation: acn.gov.it/aggiornamenti-mensili-microsoft-25
    After
    no authoritative guidance recorded
    CNA ↗
  51. Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
    Before
    Mitigation available
    After
    Awaiting fix
    CNA ↗
  52. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    CSIRT Italia ↗
  53. ENISA EUVD mappingEUVD-2026-99299 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-99299"}
    ENISA EUVD ↗
  54. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
  55. CVSS scoreCVSS vector changed while the displayed base score remained 7.8.
    Before
    7.8 (CVSS 3.1 · CNA · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
    After
    7.8 (CVSS 3.1 · CNA · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2026-99299↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-83518 · cve.blacktree.nl