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CVE-2026-53440

medium CVSS 4.3 EPSS 0.4%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-53440 applies to, and the release that fixes it where the sources name one.

Jenkins 1.509 fixed in 2.555.3

At a glance

Severity
Medium
CVSS base score
4.3 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.4% probability of exploitation in the next 30 days, higher than 28% of scored vulnerabilities
Weakness
CWE-601
Published
2026-06-10
NVD CVE.org

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