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CVE-2025-27371

MEDIUM
6.9
CVSS Score
Published: March 3, 2025 at 12:00 AM UTC
Updated: June 17, 2026 at 09:03 AM UTC
1 product affected across 1 vendorOauth Jwt Client Authentication

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (5)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMmitre
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-305

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