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PatchSiren cyber security CVE debrief

CVE-2026-62751 Microsoft CVE debrief

An integer overflow or wraparound vulnerability exists in the Windows Projected File System, allowing an authorized attacker to elevate privileges locally. Multiple Windows versions are affected, including Windows 10, Windows 11, and Windows Server. This vulnerability requires immediate attention from defenders responsible for Windows systems, particularly those using Projected File System. They should assess exposure, apply patches, and verify system integrity. The vulnerability's impact is significant, allowing local privilege escalation, which can lead to further malicious activities. The CVE Program and NVD provide official records of the vulnerability, while Microsoft offers a

Vendor
Microsoft
Product
Windows 10 Version 21H2
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-10-08
Advisory published
2026-08-11
Advisory updated
2026-10-08

Who should care

Defenders responsible for Windows systems, particularly those using Projected File System, should assess exposure and apply patches. System administrators and security teams should verify system integrity and monitor for suspicious activity.

Why it matters

CVE-2026-62751 allows authorized attackers to elevate privileges locally via an integer overflow in Windows Projected File System. Defenders should apply patches, assess exposure, and verify system integrity.

  • Local privilege escalation requires immediate patching
  • Verify system integrity and monitor logs
  • Assess exposure for affected Windows versions

Technical summary

The Windows Projected File System is vulnerable to an integer overflow or wraparound, allowing an authorized attacker to elevate privileges locally. This affects multiple Windows versions, including Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2022, Windows Server 2025, and Windows Server 2025 (Server Core installation).

Defensive priority

Apply patches immediately for affected Windows versions, assess exposure, and verify system integrity.

Recommended defensive actions

  • Apply patches for affected Windows 10, Windows 11, and Windows Server versions
  • Assess exposure and verify system integrity
  • Monitor system logs for suspicious activity

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft offers a vendor advisory with patch information. The vulnerability affects multiple Windows versions, including Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2022, Windows Server 2025, and Windows Server 2025 (Server Core installation). Defenders should verify the

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62751 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62751

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

  • CVE-2026-62751 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62751

    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.