PT-2025-9529 · Unknown · Openid Connect Core

Pedram Hosseyni + 1 · Published 2025-03-03 · Updated 2025-03-07 · CVE-2025-27370

Positive Technologies (AI Summary)

CVSS v3.1

6.9

Medium

Base vector

AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N

Name of the Vulnerable Software and Affected Versions OpenID Connect Core versions prior to 1.0 errata set 3

Description The issue 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.

Recommendations For OpenID Connect Core versions prior to 1.0 errata set 3, consider updating to version 1.0 errata set 3 or later to resolve the issue. As a temporary workaround, restrict the use of the private key jwt authentication mechanism to minimize the risk of exploitation.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-305

CWE-863

Related Identifiers

CVE-2025-27370

Affected Products

Openid Connect Core

References · 11

• https://nvd.nist.gov/vuln/detail/CVE-2025-27370 · Security Note
• https://osv.dev/vulnerability/CVE-2025-27370 · Vendor Advisory
• https://github.com/OWASP/ASVS/issues/2678 · Note
• https://eprint.iacr.org/2025/629 · Note
• https://t.me/cvenotify/113874 · Telegram Post
• https://twitter.com/CVEnew/status/1897912357168595326 · Twitter Post
• https://openid.net/notice-of-a-security-vulnerability · Note
• https://talks.secworkshop.events/osw2025/talk/R8D9BS · Note
• https://t.me/cvedetector/19402 · Telegram Post
• https://openid.net/wp-content/uploads/2025/01/OIDF-Responsible-Disclosure-Notice-on-Security-Vulnerability-for-private_key_jwt.pdf · Note
• https://t.me/cvenotify/113216 · Telegram Post