CISA KEV catalog
Confirmed active exploitation.
Listed in CISA's catalog of Known Exploited Vulnerabilities: attackers are using it in real attacks. Patch it with priority.
- Name
- Microsoft Windows CSRSS Security Feature Bypass Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
Description
The Client-Server Run-time Subsystem (CSRSS) in Microsoft Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511 mismanages process tokens, which allows local users to gain privileges via a crafted application, aka "Windows CSRSS Security Feature Bypass Vulnerability."
Affected products
microsoft: windows 10 1507; microsoft: windows 10 1511; microsoft: windows 8.1; microsoft: windows rt 8.1; microsoft: windows server 2012
References7
- docs.microsoft.com/en-us/security-updates/securitybulletins/201… PatchVendor Advisory
- docs.microsoft.com/en-us/security-updates/securitybulletins/201… PatchVendor Advisory
- www.exploit-db.com/exploits/39740/ ExploitThird Party AdvisoryVDB Entry
- www.exploit-db.com/exploits/39740/ ExploitThird Party AdvisoryVDB Entry
- www.securitytracker.com/id/1035544 Broken LinkThird Party AdvisoryVDB Entry
- www.securitytracker.com/id/1035544 Broken LinkThird Party AdvisoryVDB Entry
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=… US Government Resource
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 63% percentile: 99 · as of 8 November 2026
- CWE
- CWE-269
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