What is CVE-2025-26685?

CVE-2025-26685 is a medium-severity vulnerability in Microsoft Defender For Identity, classified under Improper Authentication. CVSS score: 6.5/10. Published 2025-05-13.

How severe is CVE-2025-26685?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2025-26685 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Microsoft Defender For Identity

CVE-2025-26685

Improper authentication in Microsoft Defender for Identity allows an unauthorized attacker to perform spoofing over an adjacent network.

Vulnerability class: Broken Authentication

Published 2025-05-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26685 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-26685?: CVE-2025-26685 is a medium-severity vulnerability in Microsoft Defender For Identity, classified under Improper Authentication. CVSS score: 6.5/10. Published 2025-05-13.
How severe is CVE-2025-26685?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2025-26685 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.