What is the CVSS score of CVE-2025-26685?

CVE-2025-26685 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 1.3%.

Which versions of Defender For Identity are affected by CVE-2025-26685?

Organizations using Improper authentication in Microsoft Defender for Identity should be aware of notable risk from CVE-2025-26685, a improper authentication vulnerability rated CVSS 6.5.

How to fix or mitigate CVE-2025-26685?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Audit authentication configurations.

Defender For Identity CVE-2025-26685

MEDIUM

Improper Authentication (CWE-287)

2025-05-13 secure@microsoft.com

Microsoft Authentication Bypass Defender For Identity

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:41 vuln.today

CVE Published

May 13, 2025 - 17:15 nvd

MEDIUM 6.5

DescriptionCVE.org

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

AnalysisAI

Improper authentication in Microsoft Defender for Identity allows an unauthorized attacker to perform spoofing over an adjacent network. Rated medium severity (CVSS 6.5), this vulnerability is no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. Improper authentication in Microsoft Defender for Identity allows an unauthorized attacker to perform spoofing over an adjacent network. Affected products include: Microsoft Defender For Identity.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.