VulnerabilityDeferred
CVE-2025-27370
OpenID Connect Core through 1.0 errata set 2 allows audience injection in certain situations.
MEDIUM 6.9EPSS 0.34%
Does this matter?
Lower severity and a low EPSS score (0.34%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N
- EPSS
- 0.34% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-305
- Source
- cve@mitre.org
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-on-Security-Vulnerability-for-private_key_jwt.pdf
- https://talks.secworkshop.events/osw2025/talk/R8D9BS/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.