EUVD-2026-80751
GHSA-433w-6m38-6gf6
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Attacker needs config-edit access (PR:L) and a privileged admin action (UI:R) to trigger auto-approval; resulting code execution in the controller JVM yields full C:H/I:H/A:H at that authority (S:U).
Primary rating from Vendor (jenkins).
CVSS VectorVendor: jenkins
Lifecycle Timeline
5DescriptionCVE.org
Jenkins Script Security Plugin 1415.v9a_f9b_3a_c253d and earlier automatically approves the classpath entries in an item configuration when a user with Overall/Administer permission copies the item, or updates that configuration through the REST API or CLI, allowing attackers able to define classpath entries to execute arbitrary code in the context of the Jenkins controller JVM.
Articles & Coverage 1
AnalysisAI
Arbitrary code execution in Jenkins Script Security Plugin 1415.v9a_f9b_3a_c253d and earlier: when a user with job-configure privileges defines classpath entries in an item configuration, those entries are silently auto-approved the moment a user holding Overall/Administer permission copies that item or updates its configuration through the REST API or CLI. The result is code execution inside the Jenkins controller JVM (CWE-94, CVSS 8.0), but exploitation is a two-actor, confused-deputy scenario: the attacker needs pre-existing config-edit rights (PR:L) and must wait for a privileged user to perform the copy or API/CLI update (UI:R), so installations where only administrators author jobs and never copy them or drive configuration through REST/CLI are effectively unexposed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two conditions must combine: (1) the attacker must be able to define script-security classpath entries in an item/job configuration, i.e. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine remote-code-execution flaw (CWE-94) in a near-ubiquitous Jenkins plugin, but its practical risk is gated by a confused-deputy precondition rather than the raw 8.0 CVSS score implying. … 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 | Patch availability was not confirmed in the provided data: the referenced Jenkins Security Advisory 2026-09-16 (SECURITY-3897, https://www.jenkins.io/security/advisory/2026-09-16/#SECURITY-3897) is the authoritative source for the fixed Script Security Plugin release, and administrators should upgrade to the exact version listed there via the Jenkins Update Center and then restart the controller so the new plugin classloader is active. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Jenkins controllers for the Script Security Plugin at version 1415.v9a_f9b_3a_c253d or earlier, confirm whether any non-administrator holds job-configure privileges, and review the Script Security approval list for classpath entries that were auto-approved without explicit administrator sign-off; where such findings exist, treat the controller as potentially compromised and begin an incident assessment. …
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External POC / Exploit Code
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