#VU103263 Improper Handling of Case Sensitivity in OpenId Connect Authentication - CVE-2025-24399

Vulnerability identifier: #VU103263

Vulnerability risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-24399

CWE-ID: CWE-178

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenId Connect Authentication
Web applications / Modules and components for CMS

Vendor: Jenkins

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to improper handling of case sensitivity. A remote user can log in as any user by providing a username that differs only in letter case and gain administrator access to Jenkins.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenId Connect Authentication: 4.452.v2849b_d3945fa_

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External links
https://www.jenkins.io/security/advisory/2025-01-22/#SECURITY-3461

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.