Windows: Missing authentication for critical function in Microsoft Account
Summary
Microsoft Windows contains a flaw in the Microsoft Account component in which a critical function lacks authentication (CWE-306). An attacker with local access and a low-privilege account can tamper with data, which affects integrity only according to the CVSS vector. No user interaction is required, and the flaw cannot be exploited remotely. Microsoft has fixed it in the November 2026 security updates.
Affected
- Windows 10 Version 1607 (before 10.0.14393.9688)
- Windows 10 Version 1809 (before 10.0.17763.9487)
- Windows 10 Version 21H2 (before 10.0.19044.7846)
- Windows 10 Version 22H2 (before 10.0.19045.7846)
- Windows 11 Version 23H2 (before 10.0.22631.7711)
- Windows 11 Version 24H2 (before 10.0.26100.9974; one source cites 10.0.26100.33822, unconfirmed)
- Windows 11 Version 25H2 (before 10.0.26200.9974)
- Windows 11 Version 26H1 (before 10.0.28000.3501)
- Windows 11 Version 26H2 (before 10.0.26300.9974)
- Windows Server 2016 incl. Server Core (before 10.0.14393.9688)
- Windows Server 2019 incl. Server Core (before 10.0.17763.9487)
- Windows Server 2022 (before 10.0.20348.5870)
- Windows Server 2025: listed only by a third-party tracker, unverified
Fixed in
- November 2026 security update for each affected product
- KB numbers: Unknown (check the MSRC advisory)
Workaround
Unknown.
Exploitation
- Not exploited and not publicly disclosed according to Microsoft's CNA record, CISA SSVC (Exploitation: none) and the sources reviewed
- Rapid7 rates exploitation as less likely
- No public proof of concept found
Our recommendation
- Install the November 2026 security updates on all affected Windows clients and servers in the normal monthly patch cycle
- Confirm the affected builds and KB numbers in the MSRC advisory before closing the ticket
- Prioritise shared PCs and systems where user accounts could be compromised
- Windows 10 systems on Extended Security Updates must also receive this update
- Monitor the NVD entry, which was still awaiting analysis at the time of writing
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Tampering – Microsoft Account
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131291, KB5131085, KB5131096, KB5131090, KB5131087, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-112982 msrc.microsoft.com
- CVE Record CVE-2026-112982 (CVE.org) www.cve.org
- Rapid7: Patch Tuesday November 2026 www.rapid7.com
- SANS ISC diary archive isc.sans.edu
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 16:48.
Original description (NVD)
Missing authentication for critical function in Microsoft Account allows an authorized attacker to perform tampering locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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