EUVD-2026-80759
GHSA-29m4-vpx5-mmrm
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Network REST API with low complexity but PR:L (Item/Configure required) and UI:R (victim must view page); stored XSS in Jenkins admin context justifies C/I/A:H, S:U per vendor convention though S:C is arguable.
Primary rating from Vendor (jenkins).
CVSS VectorVendor: jenkins
Lifecycle Timeline
5DescriptionCVE.org
Jenkins Coverage Plugin 3.3358.v9487dde48783 and earlier does not validate the coverage results ID when a job configuration is submitted through the REST API, allowing attackers with Item/Configure permission to use a javascript: scheme URL as identifier, resulting in a stored cross-site scripting (XSS) vulnerability.
Articles & Coverage 1
AnalysisAI
Stored cross-site scripting in Jenkins Coverage Plugin 3.3358.v9487dde48783 and earlier lets an attacker who already holds Item/Configure permission on a job submit a job configuration through the REST API with a javascript: scheme URL in the unvalidated coverage results ID field, which is then stored and rendered when a victim later opens the job's coverage page. Exploitation therefore requires authenticated low-privilege access (CVSS PR:L) plus victim interaction (UI:R), meaning it is not usable against default unauthenticated Jenkins deployments; Impact on confidentiality, integrity and availability is rated High (CVSS 8.0). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated Jenkins user who already holds Item/Configure permission on a job, using that access to submit a job configuration through the REST API with a 'javascript:' scheme URL supplied as the coverage results ID (the unvalidated field). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but conditional vulnerability, not an internet-facing critical. … 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 | Vendor-released patch: upgrade the Jenkins Coverage Plugin to 3.3361.v0626103a_67e6 (current line) or 3.3325.3327.v26c59e218691 (alternate fixed line) as listed in the Jenkins advisory SECURITY-4118 (https://www.jenkins.io/security/advisory/2026-09-16/#SECURITY-4118) and EUVD-2026-80759; this is the only complete fix, since the root cause is missing validation inside the plugin and cannot be closed by hardening the controller alone. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Jenkins controllers and identify every installation of the Coverage Plugin at or below version 3.3358.v9487dde48783, then audit which accounts hold Item/Configure or broader job-configuration permissions and remove that permission from anyone who does not strictly require it; also review recent REST API job-configuration changes for unexpected coverage-results ID values containing 'javascript:' or other non-HTTP schemes. …
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External POC / Exploit Code
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