CVE-2026-54123: Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an authorized…
CVE-2026-54123 · Severity: medium · CVSS 5.5 · Published 2026-08-11
Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an authorized attacker to disclose information locally.
No. Junglewise Threat Intelligence has no report of CVE-2026-54123 being exploited in the wild.
How severe is CVE-2026-54123?
Medium severity, with a CVSS score of 5.5, published 11 August 2026.
Which products and versions are affected?
Microsoft Defender for Endpoint. The advisory does not name versions.
Is there a fix for CVE-2026-54123?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-54123?
Check whether you run Microsoft Defender for Endpoint. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.