MEDIUMCVSS 4.3EPSS 0.3%

CVE-2026-53436

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

Published: 2026-06-10
Modified: 2026-08-13
EPSS percentile: 21%
Aliases: GHSA-3rqh-hch3-jhpc
Sources: github-advisory

Summary

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.

Affected packages

Ecosystem	Package	Affected versions	Fixed versions
Maven	org.jenkins-ci.main:jenkins-core	—	2.568, 2.555.3

Remediation: Upgrade to 2.568 or later.

References

https://github.com/advisories/GHSA-3rqh-hch3-jhpc

Includes data from the GitHub Advisory Database, licensed under CC-BY 4.0.

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EPSS scores provided by the FIRST.org Exploit Prediction Scoring System.