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Vulnerabilities

Vulnerability · CVE-2025-26685

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

Published May 13, 2025 · catalog updated Feb 13, 2026 · Microsoft Microsoft Defender for Identity

Check this week

CVE-2025-26685 is not in CISA KEV. FIRST estimates a 73.00% chance of exploitation in the next 30 days. Check whether you run Microsoft Microsoft Defender for Identity.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
73.00%
Remediation
Advisory link
Affected products
vendor Microsoft Microsoft Defender for Identity -

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Microsoft Defender for Identity --

How to fix CVE-2025-26685

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-26685 is not in CISA KEV. FIRST estimates a 73.00% chance of exploitation in the next 30 days. Check whether you run Microsoft Microsoft Defender for Identity.

Which versions are affected?

Compare what you have installed with Microsoft Microsoft Defender for Identity - -. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 73.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 13, 2025 · EUVD

    Detected

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

  2. Feb 13, 2026 · EUVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2025-26685

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-14436

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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.