CVE-2026-53437

EUVD-2026-36021
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 tab or newline characters between `//`, allowing attackers to perform phishing attacks.
Open Redirect
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
4.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 28%
Affected Products (NVD)
VendorProductVersion
jenkinsjenkins
𝑥
< 2.555.3
jenkinsjenkins
𝑥
< 2.568
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3711+3755
https://access.redhat.com/security/cve/CVE-2026-53437
https://bugzilla.redhat.com/show_bug.cgi?id=2487544
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53437.json