Windows Defender vulnerabilities and fixes

CVEs that mention Windows Defender, ranked by priority. 1 tracked.

Windows Defender has 1 tracked vulnerability, 0 critical. A fixed release or vendor patch exists for 1. Most recent: 2026-08-11. Highest priority: CVE-2026-54123 (score 34/100).

• CVE-2026-54123 MEDIUM 5.5 UPGRADE Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an author

FAQ

How do I fix Windows Defender vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is Windows Defender being exploited right now?

None of the tracked Windows Defender CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which Windows Defender CVE should I patch first?

CVE-2026-54123 currently ranks highest (34/100): Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an author.

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