Open redirect in Jenkins and Jenkins LTS - CVE-2026-53437
Published: June 22, 2026
Vulnerability identifier: #VU134980
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-53437
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Jenkins
Affected software:
Jenkins
Jenkins LTS
Jenkins
Jenkins LTS
Detailed vulnerability description
The vulnerability allows a remote attacker to redirect victims to arbitrary URL.
The vulnerability exists due to the affected application improperly determines that a redirect URL after login is legitimately pointing to Jenkins when it contains tab or newline characters between "//". A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.
Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.
How to mitigate CVE-2026-53437
Install updates from vendor's website.