What is the CVSS score of CVE-2025-21396?

CVE-2025-21396 has a CVSS 3.1 base score of 8.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H. EPSS exploitation probability: 2.0%.

Which versions of Account are affected by CVE-2025-21396?

Organizations using Missing authorization in Microsoft Account face notable risk from CVE-2025-21396, a missing authorization vulnerability rated CVSS 8.2.

How to fix or mitigate CVE-2025-21396?

Within 30 days: Identify all affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Account CVE-2025-21396

HIGH

Missing Authorization (CWE-862)

2025-01-29 secure@microsoft.com

Microsoft Authentication Bypass Account

8.2

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.2 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:06 vuln.today

CVE Published

Jan 29, 2025 - 23:15 nvd

HIGH 8.2

DescriptionCVE.org

Missing authorization in Microsoft Account allows an unauthorized attacker to elevate privileges over a network.

AnalysisAI

Missing authorization in Microsoft Account allows an unauthorized attacker to elevate privileges over a network. Rated high severity (CVSS 8.2), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Missing Authorization (CWE-862), which allows attackers to access resources or perform actions without proper authorization checks. Missing authorization in Microsoft Account allows an unauthorized attacker to elevate privileges over a network. Affected products include: Microsoft Account.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement role-based access control, validate authorization on every request server-side, apply principle of least privilege.