EUVD-2026-80765
GHSA-4f55-vrqg-62c7
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Remote unauthenticated attacker crafts a link but needs victim to click and log in (UI:R); open redirect yields only limited integrity impact with no confidentiality or availability effect.
Primary rating from Vendor (jenkins).
CVSS VectorVendor: jenkins
Lifecycle Timeline
2DescriptionCVE.org
Jenkins Keycloak Authentication Plugin 2.4.1 and earlier does not restrict the redirect URL after login, allowing attackers to perform phishing attacks.
AnalysisAI
Open redirect in the Jenkins Keycloak Authentication Plugin 2.4.1 and earlier lets an unauthenticated attacker craft a login URL whose post-authentication redirect target is not validated, sending a victim who completes Keycloak login to an arbitrary external site (CWE-601, vendor CVSS 4.3). Only Jenkins instances where this plugin is installed and configured as the active authentication realm are affected, and exploitation requires the victim to click the supplied link and finish authentication (UI:R), so impact is confined to phishing and credential-harvesting rather than direct access to Jenkins. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the Jenkins Keycloak Authentication Plugin (version 2.4.1 or earlier) to be installed and in use as the authentication realm, and requires user interaction (UI:R): a valid Jenkins user must click an attacker-supplied login link and complete Keycloak authentication for the unvalidated redirect to fire. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a low-severity open redirect (CWE-601) with a vendor CVSS of 4.3 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N), and the signals are internally consistent rather than conflicting. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The exact patched release is not specified in the provided intelligence, so treat the Jenkins security advisory at https://www.jenkins.io/security/advisory/2026-09-16/#SECURITY-3767 as the authoritative source and upgrade the Keycloak Authentication Plugin to the first fixed version listed there (or later) via the Jenkins Plugin Manager; no vendor-released patch version could be confirmed from the supplied data at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
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