GHSA-8hmv-92wm-39ch

Jenkins Open Redirect vulnerability

Description

Various features in Jenkins redirect users to partially user-controlled URLs inside Jenkins. To prevent open redirect vulnerabilities, Jenkins limits redirections to safe URLs (neither absolute nor scheme-relative/network-path reference). In Jenkins 2.499 and earlier, LTS 2.492.1 and earlier, redirects starting with backslash (`\`) characters are considered safe. This allows attackers to perform phishing attacks by having users go to a Jenkins URL that will forward them to a different site, because browsers interpret these characters as part of scheme-relative redirects. Jenkins 2.500, LTS 2.492.2 considers redirects to URLs starting with backslash (`\`) characters to be unsafe, rejecting such redirects.

Affected packages

References

• https://nvd.nist.gov/vuln/detail/CVE-2025-27625 ADVISORY
• https://github.com/jenkinsci/jenkins/commit/4a9a3ecd08fc00d2f1c1125be789d8be24f02c9e WEB
• https://github.com/jenkinsci/jenkins PACKAGE
• https://www.jenkins.io/security/advisory/2025-03-05/#SECURITY-3501 WEB

Sources