What is CVE-2026-53440?

CVE-2026-53440 is a medium-severity vulnerability, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-06-10.

How severe is CVE-2026-53440?

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

CVE-2026-53440

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 container" security realm is safe to redirect to after login, allowing attackers to perform phishing attacks by redire…

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.

Weakness classification (CWE)

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

References

jenkinsci-cert@googlegroups.com

Frequently asked questions

What is CVE-2026-53440?: CVE-2026-53440 is a medium-severity vulnerability, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-06-10.
How severe is CVE-2026-53440?: Medium severity. CVSS v3 base score is 4.3 out of 10.