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PatchSiren cyber security CVE debrief

CVE-2026-62779 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-11T17:04:24.658Z and has not been modified since then. The NVD entry is currently 7.8 HIGH. This vulnerability in Windows Schannel allows an authorized attacker to elevate privileges locally due to a use-after-free issue. Defenders should assess exposure and verify system configurations for Windows 11 and Windows Server 2025 systems. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity.

Vendor
Microsoft
Product
Windows 11 Version 24H2
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 11 and Windows Server 2025 systems should assess exposure and verify system configurations. They should prioritize verifying exposure and assessing local privilege escalation risks in Windows 11 and Windows Server 2025 environments due to the vulnerability in Windows Schannel. This includes reviewing system configurations, assessing potential impact, and applying patches as available

Why it matters

Defenders should prioritize verifying exposure and assessing local privilege escalation risks in Windows 11 and Windows Server 2025 environments due to the vulnerability in Windows Schannel.

  • Local privilege escalation risk
  • Potential for unauthorized access
  • Need for patch verification and application

Technical summary

A use-after-free vulnerability in Windows Schannel allows an authorized attacker to elevate privileges locally. This vulnerability is identified as CVE-2026-62779 and has a CVSS score of 7.8 with a HIGH severity rating. The vulnerability affects Windows 11 and Windows Server 2025 systems, and defenders should assess exposure and verify system configurations. The technical details indicate a use-after-free issue in the Windows Schannel component.

Defensive priority

Defenders should prioritize verifying exposure and assessing local privilege escalation risks in Windows 11 and Windows Server 2025 environments.

Recommended defensive actions

  • Verify system configurations and inventory for affected Windows 11 and Windows Server 2025 versions
  • Assess local privilege escalation risks in Windows Schannel
  • Apply patches from Microsoft as available

Evidence notes

The CVE record and source item provide details on the vulnerability in Windows Schannel, but specific exploitation or impact data is not available. The vulnerability is identified as a use-after-free issue in Windows Schannel, which allows an authorized attacker to elevate privileges locally. The source item and CVE record do not provide explicit evidence of exploitation or detailed impact data.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62779 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62779

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

  • CVE-2026-62779 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62779

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

Supplemental references

  • Windows Schannel Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/62xxx/CVE-2026-62779.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62779

    Supplemental source - vendor-advisory, patch

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.