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CVE-2026-77904 Microsoft CVE debrief

CVE-2026-77904 is a high-severity vulnerability in the Windows Volume Manager Extension Driver that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH. Microsoft has released a patch for this vulnerability, and defenders should prioritize updating affected systems. Affected systems include Windows 10, Windows 11, and Windows Server. The CVE record and NVD detail page provide information on the vulnerability, including its CVSS score and affected systems. Defenders should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. The vulnerability is a 堆基

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-10-14
Advisory published
2026-09-08
Advisory updated
2026-10-14

Who should care

Defenders responsible for Windows systems, especially those with high-risk exposure, should prioritize updating affected systems. This includes operators managing Windows 10, Windows 11, and Windows Server deployments. Vulnerability management and security teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported

Why it matters

CVE-2026-77904 is a high-severity vulnerability in the Windows Volume Manager Extension Driver that allows an authorized attacker to elevate privileges locally. Defenders should prioritize updating affected systems to prevent exploitation.

  • Privilege escalation may occur on affected systems
  • Local attackers may exploit this vulnerability
  • Patching is required to prevent exploitation
  • System updates and verification are necessary

Technical summary

The vulnerability is a heap-based buffer overflow in the Windows Volume Manager Extension Driver that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH. Affected systems include Windows 10, Windows 11, and Windows Server.

Defensive priority

Apply patches immediately for affected Windows systems, especially those with high-risk exposure.

Recommended defensive actions

  • Apply patches for affected Windows systems
  • Verify system updates and ensure affected systems are patched
  • Monitor system logs for potential exploitation attempts

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, including its CVSS score and affected systems. Microsoft has released a patch for this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77904 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77904

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

  • CVE-2026-77904 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77904

    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.