Vulnerability Description
OpenID Connect Core through 1.0 errata set 2 allows audience injection in certain situations. When the private_key_jwt authentication mechanism is used, a malicious Authorization Server could trick a Client into writing attacker-controlled values into the audience, including token endpoints or issuer identifiers of other Authorization Servers. The malicious Authorization Server could then use these private key JWTs to impersonate the Client.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- 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
- https://talks.secworkshop.events/osw2025/talk/R8D9BS/
FAQ
What is CVE-2025-27370?
CVE-2025-27370 is a vulnerability with a CVSS score of 6.9 (MEDIUM). OpenID Connect Core through 1.0 errata set 2 allows audience injection in certain situations. When the private_key_jwt authentication mechanism is used, a malicious Authorization Server could trick a ...
How severe is CVE-2025-27370?
CVE-2025-27370 has been rated MEDIUM with a CVSS base score of 6.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-27370?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.