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Full vulnerability report · 2026
CVE-2026-69641High confidence

Microsoft Exchange Server Elevation of Privilege Vulnerability

Microsoft · Microsoft Exchange Server 2016 Cumulative Update 23

9.1CriticalCVSS 3.1
Recommended action
Within 7 days

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

Patch available
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2026-73146

No EUVD known-exploited evidence

Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

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
9.1 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

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

Patch available
01

What, why and how

Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

What

Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Why

The application reaches a protected operation without first confirming that the requester is authorised.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may gain additional privileges.

What

Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Why

The application reaches a protected operation without first confirming that the requester is authorised.

How

An attacker operating through a network path may attempt exploitation with elevated 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
a network path → Missing Authorization → gain additional privileges
Attack surface
Network
Privileges required
High: elevated access is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-862 ↗

CWE-862: Missing Authorization. The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRHighPrivileges required: The attacker needs elevated or administrative privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security 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
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkPrivilege escalationCWE-862
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-73146Official EUVD mapping

Missing authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3243Microsoft Windows: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows Server, Microsoft Windows 10 und Microsoft Windows 11 ausnutzen, um seine Privilegien zu erhöhen, um einen Denial of Service herbeizuführen, um Informationen offenzulegen und um beliebigen Code auszuführen.

Official advisory ↗
BSI · German · WID-SEC-2026-3268Microsoft Exchange Server: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Exchange Server ausnutzen, um beliebigen Code auszuführen, Spoofing-Angriffe durchzuführen, erweiterte Berechtigungen zu erlangen, Daten zu manipulieren oder offenzulegen sowie einen Denial-of-Service-Angriff zu verursachen.

Official advisory ↗
INCIBE-CERT · Spanish · boletin-de-seguridad-de-microsoft-septiembre-de-2026Boletín de seguridad de Microsoft: septiembre de 2026

vulnerabilidad de Ejecución Remota de Código en Windows Event Logging Service CVE-2026-69496: vulnerabilidad de Ejecución Remota de Código en Windows Compressed Folder CVE-2026-69525: vulnerabilidad de Ejecución Remota de Código en Remote Desktop Services CVE-2026-69579: vulnerabilidad de Ejecución Remota de Código en Windows Message Queuing CVE-2026-69586: vulnerabilidad de Ejecución Remota de Código en Microsoft Windows PDF CVE-2026-69590: vulnerabilidad de Ejecución Remota de Código en Windows Routing and Remote Access Service (RRAS) CVE-2026-69595: vulnerabilidad de Ejecución Remota de Código en Windows Services for NFS ONCRPC XDR Driver CVE-2026-69641: vulnerabilidad de Elevación de Privilegios en Microsoft Exchange Server CVE-2026-69669: vulnerabilidad de Ejecución Remota de Código en Windows Kernel CVE-2026-69715: vulnerabilidad de Ejecución Remota de Código en Windows Direct Show CVE-2026-69730: vulnerabilidad de Ejecución Remota de Código en Windows DNS Server CVE-2026-69768: vulnerabilidad de Ejecución Remota de Código en Windows RNDIS CVE-2026-69769: vulnerabilidad de Ejecución Remota de Código en Windows HTTP Print Provider CVE-2026-69819: vulnerabilidad de Ejecución Remota de Código en RPC Runtime Library CVE-2026-69824: vulnerabilidad de Ejecución Remota de Código en Microsoft St

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1149Multiples vulnérabilités dans les produits Microsoft

septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69417 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69439 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69464 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69465 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69522 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69559 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69562 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69615 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69636 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69641 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69642 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69646 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69649 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69683 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69690 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69716 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69724 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69804 du 08 septembre 2026 Bulletin de sécurité Microsoft CVE-2026-69805 du 08 septembre 2026 Bulletin de sécurité Micr

Official advisory ↗
CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-24Aggiornamenti Mensili Microsoft

nuova finestra - - CVE-2026-69652 : apre una nuova finestra - - CVE-2026-69773 : apre una nuova finestra - - CVE-2026-69895 : apre una nuova finestra - - CVE-2026-69779 : apre una nuova finestra - - CVE-2026-69777 : apre una nuova finestra - - CVE-2026-69778 : apre una nuova finestra - - CVE-2026-69771 : apre una nuova finestra - - CVE-2026-69772 : apre una nuova finestra - - CVE-2026-69890 : apre una nuova finestra - - CVE-2026-69770 : apre una nuova finestra - - CVE-2026-69891 : apre una nuova finestra - - CVE-2026-69649 : apre una nuova finestra - - CVE-2026-69643 : apre una nuova finestra - - CVE-2026-69764 : apre una nuova finestra - - CVE-2026-69641 : apre una nuova finestra - - CVE-2026-69762 : apre una nuova finestra - - CVE-2026-69642 : apre una nuova finestra - - CVE-2026-69768 : apre una nuova finestra - - CVE-2026-69889 : apre una nuova finestra - - CVE-2026-69648 : apre una nuova finestra - - CVE-2026-69769 : apre una nuova finestra - - CVE-2026-69645 : apre una nuova finestra - - CVE-2026-69646 : apre una nuova finestra - - CVE-2026-69767 : apre una nuova finestra - - CVE-2026-69680 : apre una nuova finestra - - CVE-2026-69683 : apre una nuova finestra - - CVE-2026-69684 : apre una nuova finestra - - CVE-2026-69681 : apre una nuova finestra - - CVE-2026-69682 : apre una nuova fi

Official advisory ↗
NCSC-NL · Dutch · NCSC-2026-0349Kwetsbaarheden verholpen in Microsoft Exchange server

Een kwaadwillende kan de kwetsbaarheden misbruiken om een Denial-of-Service uit te voeren, zich voor te doen als andere gebruiker, zich verhoogde rechten toe te kennen, willekeurige code uit te voeren en/of toegang te krijgen tot gevoelige gegevens. De ernstigste kwetsbaarheid met kenmerk CVE-2026-69380 heeft een CVSS-score van 9,9 en betreft een autorisatiekwetsbaarheid. Een geauthenticeerde kwaadwillende met beperkte rechten en een toegewezen mailbox kan via het netwerk zijn rechten verhogen en zich voordoen als andere gebruikers. Hierdoor kan de kwaadwillende mailboxen van Exchange-gebruikers overnemen, e-mails lezen en verzenden en bijlagen downloaden. De kwetsbaarheid met kenmerk CVE-2026-69356 heeft een CVSS-score van 9,3 en betreft een XSS-kwetsbaarheid. Een ongeauthenticeerde kwaadwillende kan een speciaal geprepareerde agenda-uitnodiging versturen. Als een gebruiker de vergaderlink opent, kan de kwaadwillende scripts uitvoeren binnen de Outlook on the Web-sessie en mailboxgegevens inzien of wijzigen. De kwetsbaarheid met kenmerk CVE-2026-69641 heeft een CVSS-score van 9,1 en betreft een autorisatiekwetsbaarheid. Een geauthenticeerde kwaadwillende met zeer hoge rechten kan via een speciaal geprepareerd verzoek mailboxautorisatiecontroles omzeilen en toegang krijgen tot de mailbox van andere gebruikers. Hierdoor kan de kwaadwillende mailboxen overnemen, e-mails lezen en verzenden en bijlagen downloaden. ``` Microsoft Exchange Server: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-55007 | 8,10 | Uitvoeren van willekeurige code | | CVE-2026-69355 | 8,80 | Uitvoeren van willekeurige code | | CVE-2026-69356 | 9,30 | Voordoen als andere gebruiker | | CVE-2026-69361 | 6,50 | Voordoen als andere gebruiker | | CVE-2026-69375 | 6,50 | Tampering | | CVE-2026-69378 | 7,50 | Denial-of-Service | | CVE-2026-69380 | 9,90 | Verkrijgen van verhoogde rechten | | CVE-2026-69382 | 5,90 | Toegang tot gevoelige gegevens | | CVE-2026-69641 | 9,10 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| ```

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
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 8 Sept 2026 · Last source change 11 Sept 2026, 22:11 UTC · CWE-862 · Missing Authorization

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 2026-09-09
European sourceENISA EUVD · EUVD-2026-73146
Product sourceCNA
Remediation sourceCVE/CNA references
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. Affected versionsThe structured affected or fixed version information changed.
    Before
    15.01.0.0 < 15.01.2507.073; 15.02.0.0 < 15.02.1544.046; 15.02.0.0 < 15.02.1748.051; 15.02.0.0 < 15.02.2562.049 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    Microsoft Exchange Server 2016 Cumulative Update 23: 15.01.0.0 < 15.01.2507.073; Microsoft Exchange Server 2019 Cumulative Update 14: 15.02.0.0 < 15.02.1544.046; Microsoft Exchange Server 2019 Cumulative Update 15: 15.02.0.0 < 15.02.1748.051; Microsoft Exchange Server Subscription Edition RTM: 15.02.0.0 < 15.02.2562.049 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  2. ENISA EUVD mappingEUVD-2026-73146 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-73146"}
    ENISA EUVD ↗
  3. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-73146↗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-2026-69641 · cve.blacktree.nl