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CVE-2026-69343 Microsoft CVE debrief

CVE-2026-69343 is a MEDIUM-severity vulnerability in Windows Overlay Filter that allows an authorized local attacker to disclose information. The CVE record was published on 2026-09-08T18:18:52.963Z and was last modified on 2026-09-16T15:23:15.053Z. The NVD entry is currently Analyzed. This vulnerability affects Windows 10, Windows 11, and various Windows Server versions. Defenders should assess exposure and prioritize patching for Windows systems with Overlay Filter enabled. The vulnerability has a CVSS score of 5.5 and is described as an out-of-bounds read.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
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 systems, especially those with Overlay Filter enabled, should assess exposure and prioritize patching. This includes verifying potential information disclosure in Windows systems, assessing exposure in Windows Overlay Filter enabled systems, and monitoring systems for potential information disclosure.

Why it matters

CVE-2026-69343 is a MEDIUM-severity vulnerability in Windows Overlay Filter that allows an authorized local attacker to disclose information. Defenders should prioritize verifying exposure in Windows systems, especially those with Overlay Filter enabled, and apply patches as soon as possible.

  • Verify potential information disclosure in Windows systems
  • Assess exposure in Windows Overlay Filter enabled systems
  • Prioritize patching for Windows systems with Overlay Filter enabled
  • Monitor systems for potential information disclosure

Technical summary

The vulnerability is an out-of-bounds read in Windows Overlay Filter, which allows an authorized local attacker to disclose information. Affected versions include Windows 10, Windows 11, and various Windows Server versions. The vulnerability has a CVSS score of 5.5 and a severity of MEDIUM. Defenders should prioritize verifying exposure in Windows systems, especially those with Overlay Filter enabled, and apply patches as soon as possible.

Defensive priority

Defenders should prioritize verifying exposure in Windows systems, especially those with Overlay Filter enabled, and apply patches as soon as possible.

Recommended defensive actions

  • Verify exposure in Windows systems, especially those with Overlay Filter enabled
  • Apply patches as soon as possible
  • Monitor systems for potential information disclosure

Evidence notes

The vulnerability is described as an out-of-bounds read in Windows Overlay Filter. Affected versions include Windows 10, Windows 11, and various Windows Server versions. The CVE has a CVSS score of 5.5 and a severity of MEDIUM.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69343 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69343

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

  • CVE-2026-69343 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69343

    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.