---
id: CVE-2026-53437
title: >-
  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 …
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 tab or newline characters between `//`, allowing attackers to perform
  phishing …
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N'
cvssSource: adp
vendor: Jenkins Project
product: Jenkins
affected:
  - Jenkins (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T15:42:49.165047Z'
published: '2026-06-10'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T12:04:50.981Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53437'
references:
  - url: 'https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3711+3755'
    label: Jenkins Security Advisory 2026-06-10
tags:
  - cve.org
epss: 0.00682
epssPercentile: 0.5037
ingestedAt: '2026-09-09T13:09:45.315Z'
---

## Overview

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.

## Affected

- `Jenkins (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.