medium6.9
CVE-2025-27370
OpenID Connect Core through 1.0 errata set 2 allows audience injection in certain situations.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| OpenID | OpenID Connect Core | through 1.0 |
Versions were read from the advisory text. No structured product data has been published for this record yet.
Weakness classification
References
- NVD record
- CVE.org record
- 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/