Microsoft Windows Event Viewer: Information disclosure via out-of-bounds read
Summary
Microsoft Windows Event Viewer contains an out-of-bounds read flaw (CWE-125) that can disclose information from memory. An attacker needs a valid local account with low privileges, and no user interaction is required. The impact is limited to confidentiality, but event logs can contain usernames, hostnames and IP addresses.
Affected
- Windows 10 Version 1607, Windows Server 2016 (including Server Core): builds before 10.0.14393.9688
- Windows 10 Version 1809, Windows Server 2019 (including Server Core): builds before 10.0.17763.9487
- Windows 10 Version 21H2: builds before 10.0.19044.7846
- Windows 10 Version 22H2: builds before 10.0.19045.7846
- Windows 11 Version 23H2: builds before 10.0.22631.7711
- Windows 11 Version 24H2: builds before 10.0.26100.9974
- Windows 11 Version 25H2: builds before 10.0.26200.9974
- Windows 11 Version 26H1: builds before 10.0.28000.3501
- Windows 11 Version 26H2: builds before 10.0.26300.9974
- Windows Server 2022: builds before 10.0.20348.5870
The full list of editions and builds has not been confirmed against the MSRC advisory.
Fixed in
Security update released with the November 2026 Patch Tuesday. Fixed builds are listed under 'affected' above. Verify exact build numbers and KB articles in the MSRC advisory.
Workaround
No vendor workaround known. Limit local and RDP logon rights to trusted accounts until the update is installed.
Exploitation
- Microsoft assessment: Exploitation Less Likely; not publicly disclosed.
- No public proof of concept found.
- No known exploitation in the wild.
- CISA SSVC: exploitation none, not automatable, partial technical impact.
Our recommendation
- Include the update in the normal monthly patch cycle on all affected Windows 10, Windows 11 and Windows Server systems.
- Prioritise multi-user terminal servers and RDS hosts, where local users are common.
- Review who holds local logon and RDP rights.
- This is not an emergency patch.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Information disclosure – Windows Event Viewer
- 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 (MSRC) msrc.microsoft.com
- CVE.org CVE Record www.cve.org
- Strix CVE-2026-95977 www.strix.ai
- Rapid7 Patch Tuesday November 2026 www.rapid7.com
- BleepingComputer November 2026 Patch Tuesday www.bleepingcomputer.com
- Senserva KB5131096 summary senserva.com
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, 16:33.
Original description (NVD)
Out-of-bounds read in Windows Event Viewer allows an authorized attacker to disclose information 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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