MSRC-CVE-2026-105726 — Microsoft Defender Information Disclosure Vulnerability

Summary

Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What type of information could be disclosed by this vulnerability?
An attacker who successfully exploited this vulnerability could potentially read portions of heap memory.

Security updates
4.18.26060.3008 — https://learn.microsoft.com/en-us/defender-endpoint/microsoft-defender-endpoint-releases#windows-antivirus--june-2026--platform-418260603008--engine-11260603008

Vulnerabilities 1

Medium 5.5

CVE-2026-105726

Microsoft Defender Information Disclosure Vulnerability

Out-of-bounds read in Microsoft Defender allows an authorized attacker to disclose information locally.

Microsoft Microsoft Defender for Endpoint for Windows Windows

Oct 13, 2026

Revision history

2026-11-10 #3
Updated an acknowledgement. This is an informational change only.
2026-11-02 #2
Updated an acknowledgement. This is an informational change only.
2026-10-13 #1
Information published.

References

CVE-2026-105726 Microsoft Defender Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105726
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss