CVE-2026-53436

Medium

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.

SeverityMedium

CVSS4.3

Exploit probability—

Product

Jenkins

PublishedJun 10, 2026

First seenJun 10, 2026

Weakness typeCWE-601Open redirect

How to fix

Update

jenkins jenkins2.555.3, 2.568 or later
org.jenkins-ci.main:jenkins-core2.568, 2.555.3 or later

Vendor advisories

jenkins.io/security/advisory/2026-06-10/#SECURITY-3711+3755

Affected products

Product	Affected versions	Fixed in
jenkins jenkins	v < 2.555.3, v < 2.568	2.555.3, 2.568
org.jenkins-ci.main:jenkins-coreMaven	2.556 ≤ v < 2.568, v < 2.555.3	2.568, 2.555.3

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