EUVD-2026-36021
GHSA-463r-5m89-4xfr
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessCraft login URL with tab/newline redirect bypass
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DeliveryDistribute phishing link via email or messaging
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ExploitVictim clicks link and authenticates to real Jenkins
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ExecutionJenkins redirect logic accepts bypass URL
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PersistBrowser follows redirect to attacker-controlled phishing site
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ImpactAttacker harvests credentials or delivers malicious content
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V3 - Web Frontend Security Redirect URL validation
MITRE ATT&CK
1 technique across 1 tactic: Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Exploitation requires that a victim user clicks a specially crafted Jenkins login URL containing a redirect parameter with tab or newline characters injected between |
| Impact | CVSS 4.3 with vector AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N positions this as a medium-severity, network-exploitable vulnerability with no confidentiality or availability impact. The attack is unauthenticated from the attacker's perspective (PR:N) and low-complexity (AC:L), but requires victim interaction (UI:R) - the user must click a crafted link. The integrity-only impact (I:L) reflects the phishing nature rather than direct system compromise. No KEV listing and no public exploit identified at time of analysis; EPSS data was not provided in the available intelligence feed, making quantitative exploitation probability unavailable. Despite the moderate CVSS score, real-world risk is contextually elevated in CI/CD environments where Jenkins credentials commonly grant broad pipeline, repository, and secrets access - a successful credential-phishing attack could have cascading impact well beyond what CVSS captures. Internet-facing Jenkins deployments and organizations where users routinely receive Jenkins-generated links in notifications represent the highest-risk populations. The attack complexity is practically lower than even AC:L implies, since the bypass technique (special character injection) is well-understood in the open-redirect class. |
| Exploit ScenarioDerived | An attacker crafts a Jenkins login URL where the post-authentication redirect parameter contains tab or newline characters between |
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Alert meAnalysisAIv1 – Jun 10, 2026
Open redirect in Jenkins login flow enables phishing attacks by exploiting improper redirect URL validation. Tab or newline characters injected between // in a post-login redirect URL bypass Jenkins' legitimacy check, redirecting authenticated victims to attacker-controlled sites. Affects Jenkins weekly 2.567 and earlier and LTS 2.555.2 and earlier; vendor-released patches are available. No public exploit identified at time of analysis, and no CISA KEV listing exists, but the bypass technique is trivially derivable from the public advisory.
RemediationAI
Vendor-released patches are available: upgrade Jenkins weekly to version 2.568 or later, or upgrade Jenkins LTS to version 2.555.3 or later. These fix versions are confirmed by EUVD-2026-36021 and the Jenkins security advisory at https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3711+3755. If immediate patching is not feasible, restrict the Jenkins login endpoint to trusted internal networks or VPN-only access - this eliminates the attacker's ability to distribute phishing login URLs to users who access Jenkins from external networks, though it does not address insider or already-networked threat actors. As an additional control, configure web application firewall rules to strip or reject login redirect parameters containing tab (%09) or newline (%0A, %0D) encoded characters. Note that user-awareness training (instructing users to verify the URL bar after login) is a weak compensating control and should not substitute for patching.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in maven
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Jenkins implements a post-login redirect mechanism intended to return users to their destination within the Jenkins application after completing authentication. CWE-601 (URL Redirection to Untrusted Site / Open Redirect) describes the root cause class: insufficient validation of user-supplied redirect URLs. The specific bypass exploits a parsing inconsistency - Jenkins' URL validation logic does not account for whitespace control characters (tab \t, newline \n) embedded between // in the redirect value. These characters are normalized or stripped by browsers during navigation but are not normalized by Jenkins' validator, so a crafted URL passes the legitimacy check while resolving to an external domain in the browser. The CPE string cpe:2.3:a:jenkins_project:jenkins:*:*:*:*:*:*:*:* confirms this affects the core Jenkins application across all platforms and deployment types, as reported by the Jenkins project itself.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Primary rating from Vendor (jenkins).
CVSS VectorVendor: jenkins
Lifecycle Timeline
2DescriptionCVE.org
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.
Blast Radius
ecosystem impact- 2 maven packages depend on org.jenkins-ci.main:jenkins-core (2 direct, 0 indirect)
Ecosystem-wide dependent count for version 2.556.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
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