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CVE-2026-77905 Microsoft CVE debrief

CVE-2026-77905 is a high-severity vulnerability in Windows Management Instrumentation that allows an authorized attacker to elevate privileges locally. The CVE record was published on 2026-09-08T18:20:40.560Z and has not been modified since then. The NVD entry is currently Analyzed. This vulnerability affects Windows systems, particularly those in environments where local privilege escalation is a concern. Defenders should prioritize patching this vulnerability to mitigate potential risks. The vulnerability is a use-after-free issue, and Microsoft has provided a patch for this vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
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 in environments where local privilege escalation is a concern, should prioritize patching this vulnerability.

Why it matters

CVE-2026-77905 is a high-severity vulnerability in Windows Management Instrumentation that allows an authorized attacker to elevate privileges locally. Defenders should prioritize patching this vulnerability, especially in environments where local privilege escalation is a concern.

  • Potential local privilege escalation
  • Increased risk of lateral movement
  • Possible exploitation by authorized attackers

Technical summary

The vulnerability is a use-after-free issue in Windows Management Instrumentation that allows an authorized attacker to elevate privileges locally. The CVSS score is 7, indicating a high severity. This issue affects Windows Management Instrumentation, and defenders should focus on patching this vulnerability, especially in environments where local privilege escalation is a concern. The patch provided by Microsoft should be applied to mitigate the risk of potential exploitation.

Defensive priority

Defenders should prioritize patching this vulnerability, especially in environments where local privilege escalation is a concern.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Review and update vulnerability management processes to ensure timely patching of high-severity vulnerabilities
  • Monitor systems for potential exploitation attempts

Evidence notes

The vulnerability is described as a use-after-free issue in Windows Management Instrumentation. Microsoft has provided a patch for this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77905 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77905

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

  • CVE-2026-77905 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77905

    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.