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CVE-2026-53436

medium CVSS 4.3 EPSS 0.4%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-53436 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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