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PatchSiren cyber security CVE debrief

CVE-2026-70567 Microsoft CVE debrief

A double free vulnerability in the Windows Display Enhancement Service allows an authorized attacker to elevate privileges locally. This CVE was published on 2026-09-08T18:20:09.290Z and was last modified on 2026-09-16T21:16:53.993Z. The NVD entry is currently Analyzed. The vulnerability affects Windows 11 and Windows Server 2025 systems. Defenders responsible for these systems should assess exposure and apply patches or updates to address the vulnerability. The CVSS score for this vulnerability is 7, indicating a High severity level. The vulnerability can be exploited locally, and defenders should prioritize verifying exposure and applying patches or updates to address the issue.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-16
Advisory published
2026-09-08
Advisory updated
2026-09-16

Who should care

Defenders responsible for Windows 11 and Windows Server 2025 systems should assess exposure and apply patches or updates to address the vulnerability.

Why it matters

This vulnerability allows an authorized attacker to elevate privileges locally, which can have significant consequences for Windows 11 and Windows Server 2025 systems. Defenders should prioritize verifying exposure and applying patches or updates to address the vulnerability.

  • Verify exposure of Windows 11 and Windows Server 2025 systems to this vulnerability
  • Apply patches or updates provided by Microsoft to address the vulnerability
  • Monitor systems for potential exploitation attempts

Technical summary

The vulnerability is a double free issue in the Windows Display Enhancement Service, which can allow an authorized attacker to elevate privileges locally. The CVSS score for this vulnerability is 7, indicating a High severity level. The vulnerability affects Windows 11 and Windows Server 2025 systems. The vulnerability can be exploited locally, and defenders should prioritize verifying exposure and applying patches or updates to address the issue. The NVD entry is currently Analyzed.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Windows 11 and Windows Server 2025 systems.

Recommended defensive actions

  • Verify exposure of Windows 11 and Windows Server 2025 systems to this vulnerability
  • Apply patches or updates provided by Microsoft to address the vulnerability
  • Monitor systems for potential exploitation attempts

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, including its CVSS score and vector. The NVD entry is currently Analyzed. The CVE record was published on 2026-09-08T18:20:09.290Z and has not been modified since then. The vulnerability affects Windows 11 and Windows Server 2025 systems. Defenders should verify exposure and apply patches or updates provided by Microsoft to address the vulnerability. The CVE Program record and NVD detail page are official and

Sources and references

Verified primary and authoritative sources

  • CVE-2026-70567 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-70567

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

  • CVE-2026-70567 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-70567

    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.