Vulnerability · Published Mar 3, 2025 · Assigned by mitre
CVE-2025-27370
Medium 6.9
In plain English
A medium-severity security flaw in OpenID Connect from OpenID. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenID | OpenID Connect | 0 – through 1.0 errata set 2 |
Weakness: CWE-305 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N
References
- https://openid.net/wp-content/uploads/2025/01/OIDF-Responsible-Disclosure-Notice-on-Security-Vulnerability-for-private_key_jwt.pdf
- https://openid.net/notice-of-a-security-vulnerability/
- https://talks.secworkshop.events/osw2025/talk/R8D9BS/
- https://github.com/OWASP/ASVS/issues/2678
- https://eprint.iacr.org/2025/629