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PatchSiren cyber security CVE debrief

CVE-2026-25184 Microsoft CVE debrief

Applocker Filter Driver (applockerfltr.sys) Elevation of Privilege Vulnerability allows an authorized attacker to elevate privileges locally due to a concurrent execution using shared resource with improper synchronization ('race condition'). Defenders responsible for Windows 11 and Windows Server systems, especially those with elevated privileges, should assess exposure and apply patches. The CVE record was published on 2026-04-14T16:56:54.535Z and has not been modified since then. The NVD entry is currently 7.0 HIGH. This vulnerability requires verification and patching to prevent potential attacks.

Vendor
Microsoft
Product
Windows 11 version 23H2
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders responsible for Windows 11 and Windows Server systems, especially those with elevated privileges, should assess exposure and apply patches.

Why it matters

CVE-2026-25184 is a high-severity elevation of privilege vulnerability in the Applocker Filter Driver that requires verification and patching to prevent potential attacks.

  • Verify exposure and apply patches to prevent potential elevation of privilege
  • Restrict access to sensitive systems and monitor for suspicious activity
  • Implement compensating controls, such as least privilege and access controls

Technical summary

The Applocker Filter Driver (applockerfltr.sys) elevation of privilege vulnerability allows an authorized attacker to elevate privileges locally due to a concurrent execution using shared resource with improper synchronization ('race condition'). This vulnerability affects Windows 11 and Windows Server systems, especially those with elevated privileges. Defenders should prioritize verifying exposure and applying patches.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Windows 11 and Windows Server systems, especially those with elevated privileges.

Recommended defensive actions

  • Verify system exposure by checking installed Windows versions and applying patches
  • Restrict access to sensitive systems and monitor for suspicious activity
  • Implement compensating controls, such as least privilege and access controls

Evidence notes

The CVE record and source item provide details on the Applocker Filter Driver elevation of privilege vulnerability. However, specific details on exploitation and impact are limited.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-25184 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-25184

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-25184 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-25184

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.