CVE-2026-53436 Jenkins Open Redirect via Relative Path Segments in Post-Login Redirect URL

What is CVE-2026-53436?

CVE-2026-53436 is a medium-severity vulnerability in Jenkins Jenkins, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Jenkins 2.567 and earlier, LTS 2.555.2 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins when it contains relative path segments (`./` or `../`), allowing attackers to perform phishing attacks.

Weakness: CWE-601

Which versions are affected by CVE-2026-53436?

5 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core and jenkins. It affects 1 product.

Products include Jenkins Jenkins.

How do I fix CVE-2026-53436?

Upgrade org.jenkins-ci.main:jenkins-core to a fixed version for your release line: 2.555.3 or 2.568.

Is CVE-2026-53436 being exploited?

There is no known exploitation of CVE-2026-53436 in the wild and no public exploit code.

Other vulnerabilities in Jenkins Jenkins

• CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal Exploited Critical 9.8
• CVE-2018-1000861 Jenkins Stapler Web Framework Deserialization of Untrusted Data Exploited Critical 9.8
• CVE-2017-1000353 Jenkins Remote Code Execution Exploited Critical 9.8
• CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure Exploited High 7.5
• CVE-2021-21690 Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins Critical 9.8

All Jenkins Jenkins vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-jenkins-2026-53436, GHSA-3rqh-hch3-jhpc, MINI-2qh3-h4f8-49q9, MINI-4xg5-g9mw-jmrw, MINI-7g78-8j2h-c2gv, MINI-868r-mf3g-vxr8 and 3 more.