CVE-2025-27370

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.

The following products are affected by CVE-2025-27370 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-27370.

URL	Resource
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/