EUVD-2026-36024
GHSA-92m7-4fpw-2wxm
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
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Lifecycle Timeline
3DescriptionCVE.org
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 redirecting users to an attacker-controlled domain.
AnalysisAI
Open redirect in Jenkins 2.567 and earlier (LTS 2.555.2 and earlier) enables unauthenticated remote attackers to craft login URLs with a malicious external domain in the 'from' parameter under the 'Delegate to servlet container' security realm, silently redirecting authenticated users to attacker-controlled sites post-login for phishing purposes. The CVSS vector (PR:N, UI:R) confirms no attacker authentication is needed, but victim interaction is mandatory - the user must click a crafted link and complete a login. No public exploit identified at time of analysis and the vulnerability is not listed in CISA KEV; vendor-released patches are available as of 2026-06-10.
Technical ContextAI
Jenkins implements multiple pluggable security realms for authentication; the 'Delegate to servlet container' realm offloads authentication to the underlying Java servlet container (e.g., Tomcat) rather than Jenkins' own user database. Post-login redirection is controlled by a 'from' query parameter appended to the login URL. CWE-601 (URL Redirection to Untrusted Site / Open Redirect) describes the root cause: the application fails to validate that the redirect target is same-origin before following the 'from' parameter, allowing arbitrary external URLs to be specified. The affected product is identified by CPE cpe:2.3:a:jenkins_project:jenkins:*:*:*:*:*:*:*:* across both the weekly and LTS release lines. This class of vulnerability is a well-understood and frequently targeted attack vector in phishing campaigns because it exploits user trust in a legitimate domain's login page.
RemediationAI
Upgrade Jenkins to version 2.568 (weekly release line) or version 2.555.3 (LTS release line), which are the vendor-released patches confirmed by EUVD-2026-36024 and the Jenkins security advisory at https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3721. If an immediate upgrade is operationally infeasible, a specific compensating control is to switch the Jenkins security realm away from 'Delegate to servlet container' to an alternative such as Jenkins' own user database or LDAP - this eliminates the vulnerable redirect path entirely, though it requires reconfiguring authentication and may affect SSO or container-managed identity workflows. As a secondary user-awareness control, administrators should alert Jenkins users to verify the full URL bar destination after login and treat unexpected redirects as suspicious; this does not prevent exploitation but reduces phishing success rates.
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