CVE-2025-27370
MEDIUM EPSS 23.6%
Published Mar 3, 20251y ago · Modified Jun 17, 20262w ago
6.9 CVSS 3.1
Published Mar 3, 2025 1y ago
Last Modified Jun 17, 2026 2w ago
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 Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Low
Integrity High
Availability None
Threat Intelligence
EPSS Exploit Probability
23.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-305
References 5
- eprint.iacr.org https://eprint.iacr.org/2025/629
- github.com https://github.com/OWASP/ASVS/issues/2678
- openid.net https://openid.net/notice-of-a-security-vulnerability/
- openid.net https://openid.net/wp-content/uploads/2025/01/OIDF-Responsible-Disclosure-Notice-on-Security-Vulnerability-for-private_key_jwt.pdf
- talks.secworkshop.events https://talks.secworkshop.events/osw2025/talk/R8D9BS/
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.