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Full vulnerability report · 2026
CVE-2026-62832High confidence

Windows User Profile Service Elevation of Privilege Vulnerability

Microsoft · Windows 10 Version 21H2

7.8HighCVSS 3.1
Recommended action
Within 7 days

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

Fix not verified
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-2026-56678

No EUVD known-exploited evidence

Improper link resolution before file access ('link following') in Windows User Profile Service 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.

Fix not verified
01

What, why and how

Improper link resolution before file access ('link following') in Windows User Profile Service allows an authorized attacker to elevate privileges locally.

What

Improper link resolution before file access ('link following') in Windows User Profile Service allows an authorized attacker to elevate privileges locally.

Why

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

How

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

What

Improper link resolution before file access ('link following') in Windows User Profile Service allows an authorized attacker to elevate privileges locally.

Why

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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 → Improper Link Resolution Before File Access ('Link Following') → 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-59 ↗

CWE-59: Improper Link Resolution Before File Access ('Link Following'). The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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-59
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-56678Official EUVD mapping

Improper link resolution before file access ('link following') in Windows User Profile Service allows an authorized attacker to elevate privileges locally.

Official EUVD record
BSI · German · WID-SEC-W-2026-2756Microsoft Windows Produkte: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Microsoft Windows Server 2012, Microsoft Windows Server 2012 R2, Microsoft Windows Server 2016, Microsoft Windows 10, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Exchange, Microsoft Windows 11, Microsoft Windows Server 2025 und Microsoft Windows ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, und um Sicherheitsvorkehrungen zu umgehen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-1001Multiples vulnérabilités dans Microsoft Windows

é Microsoft Windows CVE-2026-62815 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62816 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62817 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62818 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62819 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62820 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62822 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62823 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62824 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62832 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62876 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62877 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62878 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62880 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62881 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62883 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62885 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62886 du 11 août 2026 Bulletin de sécurité Microsoft Windows CVE-2026-62887 du 11 août 2026 Bul

Official advisory
NBSZ-NKI · Hungarian · cve-2026-62832CVE-2026-62832

A szoftver megpróbál hozzáférni egy fájlhoz a fájlnév alapján, de nem akadályozza meg megfelelően, hogy linkből vagy parancsikonból származó fájlnév nem kívánt erőforrást oldjon fel.

Official advisory
CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-23Aggiornamenti Mensili Microsoft

pplicazione opportunamente predisposta sul sistema interessato al fine di innescare una race condition e ottenere i privilegi di livello SYSTEM. Windows Container Isolation FS Filter Driver (unionfs.sys): identificata tramite la CVE-2026-72971, di tipo “Tampering” e con score CVSS v3.1 pari a 5.5, interessa il driver Windows Container Isolation FS Filter ( unionfs.sys ). Tale vulnerabilità è dovuta a un'errata risoluzione dei link prima dell'accesso ai file ( link following ), e consentirebbe a un utente autenticato la possibilità di effettuare operazioni non autorizzate a livello locale. Windows User Profile Service: identificata tramite la CVE-2026-62832, di tipo “Elevation of Privilege” e con score CVSS v3.1 pari a 7.8, interessa la componente Windows User Profile Service. La vulnerabilità è dovuta a un'errata risoluzione dei link prima dell'accesso ai file ( link following ): un utente locale in possesso delle credenziali di un secondo account (anch'esso locale) potrebbe sfruttare tale vulnerabilità eseguendo un'applicazione opportunamente predisposta al fine di caricare l'hive del registro del secondo utente, accedendo e/o modificando i dati di quest'ultimo e ottenendo potenzialmente privilegi amministrativi, senza che sia richiesta alcuna interazione da parte dell'utente interessato. Win

Official advisory
NCSC-NL · Dutch · NCSC-2026-0284Kwetsbaarheden verholpen in Microsoft Windows

An improper link resolution vulnerability in the Windows User Profile Service allows an authorized local attacker to elevate privileges by exploiting file access mechanisms.

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.
Fix not verified
Affected
10.0.19044.0 < 10.0.19044.7663; 10.0.19045.0 < 10.0.19045.7663; 10.0.22631.0 < 10.0.22631.7517; 10.0.26100.0 < 10.0.26100.9168; 10.0.26200.0 < 10.0.26200.9168; 10.0.28000.0 < 10.0.28000.2704; 10.0.20348.0 < 10.0.20348.5499
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 11 Aug 2026 · Last source change 8 Sept 2026, 21:54 UTC · CWE-59 · Improper Link Resolution Before File Access ('Link Following')

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 2026-08-14
European sourceENISA EUVD · EUVD-2026-56678
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched

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

Material change intelligence

What changed after publication

View recent updates →
  1. BlackTree coverageBlackTree article coverage changed from no BlackTree article to 1 BlackTree article.
    Before
    no BlackTree article
    After
    1 BlackTree article
    BlackTree editorial ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-56678↗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-2026-62832 · cve.blacktree.nl