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4.3 Medium

CVE-2026-53440 Jenkins 2.567 and earlier, LTS 2.555.2 and earlier does not ensure that the "from" parameter in the "Delegate to servlet…

Description

Jenkins 2.567 and earlier, LTS 2.555.2 and earlier does not ensure that the "from" parameter in the "Delegate to servlet container" security realm is safe to redirect to after login, allowing attackers to perform phishing attacks by redirecting users to an attacker-controlled domain.

Affected products and versions

Product Affected versions Fixed in
Jenkins 2.568 earliest → < 2.568 2.568
Jenkins 2.555 earliest → < 2.555.3 2.555.3

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