What is CVE-2026-53436?

CVE-2026-53436 is a medium-severity vulnerability in Jenkins, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-06-10.

How severe is CVE-2026-53436?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Open Redirect in Jenkins

CVE-2026-53436

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 at…

Vulnerability class: Open Redirect

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Jenkins

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

jenkinsci-cert@googlegroups.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-53436?: CVE-2026-53436 is a medium-severity vulnerability in Jenkins, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-06-10.
How severe is CVE-2026-53436?: Medium severity. CVSS v3 base score is 4.3 out of 10.