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CVE-2025-27370

6.9 · MEDIUM

OpenID Connect Core through 1.0 errata set 2 allows audience injection in certain situations.

Published Mar 3, 2025CWE-305EPSS 0.34%

Overview

CVE-2025-27370 is a medium-severity vulnerability. It was published on March 3, 2025 and has a CVSS 3.1 base score of 6.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refeprint.iacr.org/2025/629GitHubgithub.com/OWASP/ASVS/issues/2678Refopenid.net/notice-of-a-security-vulnerability/Refopenid.net/wp-content/uploads/2025/01/OIDF-Responsible-Disclosure-Notice-on-Security-Vulnerability-for-private_key_jwt.pdfReftalks.secworkshop.events/osw2025/talk/R8D9BS/

How CyberStrike helps

Frequently asked questions

What is CVE-2025-27370?

CVE-2025-27370 is a medium-severity vulnerability. It was published on March 3, 2025 and has a CVSS 3.1 base score of 6.9 (MEDIUM).

How severe is CVE-2025-27370?

This vulnerability has a CVSS 3.1 base score of 6.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-27370?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-27370?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-27370 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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