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Fencer Vulns
medium 4.3

CVE-2026-53436 json

Jenkins Open Redirect via Relative Path Segments in Post-Login Redirect URL

published 2026-06-10 4 mo ago modified 2026-10-26 13 d ago also BIT-jenkins-2026-53436 , EUVD-2026-36020 , GHSA-3rqh-hch3-jhpc

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 17%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.jenkins-ci.main:jenkins-core 2.555.3, 2.568
  • bitnami jenkins 2.555.3, 2.568.0
  • Jenkins Project Jenkins 2.568

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-53436 updated cvss 4.3

jenkins: Jenkins: Phishing attacks via improper redirect URL validation

  • Red Hat OpenShift Developer Tools and Services jenkins
    affected: workaround, no fix available “upgrade to Jenkins 2.568 or LTS 2.555.3”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
GitHub 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
OSV 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.jenkins-ci.main:jenkins-core
>=2.556, <2.568
<2.555.3
2.568
2.555.3
bitnami jenkins
<2.555.3
>=2.556.0, <2.568.0
2.555.3
2.568.0

Affected products

  • Jenkins Project Jenkins

Classification

Weakness
  • CWE-601 URL Redirection to Untrusted Site
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.