CVE-2025-27371

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

03/03/2025

Last modified:

15/04/2026

Description

In certain IETF OAuth 2.0-related specifications, when the JSON Web Token Profile for OAuth 2.0 Client Authentication mechanism is used, there are ambiguities in the audience values of JWTs sent to authorization servers. The affected RFCs may include RFC 7523, and also RFC 7521, RFC 7522, RFC 9101 (JAR), and RFC 9126 (PAR).

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.90 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): Required
Scope (S): Changed
Confidentiality (C): Low
Integrity (I): High
Availability (A): None

Base Score 3.x

6.90

Severity 3.x

MEDIUM

References to Advisories, Solutions, and Tools

https://eprint.iacr.org/2025/629
https://github.com/OWASP/ASVS/issues/2678
https://openid.net/notice-of-a-security-vulnerability/
https://openid.net/wp-content/uploads/2025/01/OIDF-Responsible-Disclosure-Notice-on-Security-Vulnerability-for-private_key_jwt.pdf
https://talks.secworkshop.events/osw2025/talk/R8D9BS/