CVE-2025-24399 Improper handling of case sensitivity in Jenkins OpenId Connect Authentication Plugin

High 8.8 Published 22 Jan 2025 Updated 18 Mar 2025

Attackers can bypass authentication and gain administrator access by exploiting case-insensitive username handling in Jenkins OpenID Connect plugin.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2025-24399?

CVE-2025-24399 is a high-severity authentication bypass vulnerability in Jenkins OpenId Connect Authentication Plugin, published on 22 Jan 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Jenkins OpenId Connect Authentication Plugin 4.452.v2849b_d3945fa_ and earlier, except 4.438.440.v3f5f201de5dc, treats usernames as case-insensitive, allowing attackers on Jenkins instances configured with a case-sensitive OpenID Connect provider to log in as any user by providing a username that differs only in letter case, potentially gaining administrator access to Jenkins.

Weakness: CWE-276

Which versions are affected by CVE-2025-24399?

2 open source packages ship an affected version, including org.jenkins-ci.plugins:oic-auth. It affects 1 product.

Package	Affected	Fixed in
`org.jenkins-ci.plugins:oic-auth` Maven	All versions	`4.453.v4d7765c854f4`
`org.jenkins-ci.plugins:oic-auth` Maven	All versions	`4.453.v4d7765c854f4`

Products include Jenkins Openid Connect Authentication.

How do I fix CVE-2025-24399?

Upgrade org.jenkins-ci.plugins:oic-auth to 4.453.v4d7765c854f4 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2025-24399 being exploited?

There is no known exploitation of CVE-2025-24399 in the wild and no public exploit code.

Sources

Also known as GHSA-q9cm-88jx-3vfw.