# CVE-2026-54123: Exposure of sensitive information to an unauthorized actor in Microsoft Defender for Endpoint allows an authorized…

Source: https://junglewise.ai/threats/cve-2026-54123-exposure-of-sensitive-information-to-an-unauthorized-actor-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-11  
License: CC BY 4.0 with a link back

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.

Technologies: [Microsoft Defender for Endpoint](https://junglewise.ai/threats/technologies/defender-for-endpoint). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-54123 exploited in the wild?** 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.

## Affected products

- Microsoft Defender for Endpoint

## Related threats

- [Microsoft Defender for Endpoint privilege escalation via symlink](https://junglewise.ai/threats/cve-2026-102204-improper-link-resolution-before-file-access-link-following-in)
- [Microsoft Defender for Endpoint for Mac privilege escalation via TOCTOU](https://junglewise.ai/threats/cve-2026-50658-microsoft-defender-for-endpoint-for-mac-privilege-escalation-via)
- [Microsoft Defender for Endpoint privilege escalation via TOCTOU race condition](https://junglewise.ai/threats/cve-2026-45647-microsoft-defender-for-endpoint-privilege-escalation-via-toctou)
- [Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Linux allows an authorized attacker to deny service locally.](https://junglewise.ai/threats/cve-2025-59497-time-of-check-time-of-use-toctou-race-condition-in-microsoft)