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CVE

CWE

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CVE-2025-27370

Published: Mar 3, 2025

Modified: Apr 25, 2025

PUBLISHED

CVSS v3.1

6.9

MEDIUM

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.

Vendor	Product	Versions
OpenID	OpenID Connect	affected `0 - <= 1.0 errata set 2`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

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

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