EUVD-2026-80752
GHSA-5gc7-28q4-677m
Severity by source
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable JAR URL (AV:N), but requires winning a two-download TOCTOU race (AC:H) and holding classpath-define permission (PR:L); controller-JVM code execution yields full C:H/I:H/A:H.
Primary rating from Vendor (jenkins).
CVSS VectorVendor: jenkins
Lifecycle Timeline
5DescriptionCVE.org
Jenkins Script Security Plugin 1415.v9a_f9b_3a_c253d and earlier downloads a JAR file specified by URL twice, confirming the approval of the first download and loading the classpath entries from the second, 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 the Jenkins Script Security Plugin (versions up to and including 1415.v9a_f9b_3a_c253d) lets an authenticated attacker who holds permission to define classpath entries run attacker-supplied code inside the Jenkins controller JVM. The plugin downloads the URL-specified JAR twice - it verifies approval against the first response but then loads classpath entries from the second - so an attacker who controls the hosting server can present a benign, approvable JAR on request one and a malicious JAR on request two. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated Jenkins user (PR:L) who holds permission to define classpath entries for scripts/shared libraries (e.g. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine remote code execution flaw in the Jenkins Script Security Plugin, and unusually for Jenkins advisories the vendor CVSS vector (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, 7.5) is honestly scored rather than inflated boilerplate: AC:H reflects the time-of-check/time-of-use race (the plugin downloads the URL-specified JAR twice, approving the first response but loading classpath entries from the second, so the attacker must serve a benign JAR on request one and a malicious JAR on request two), and PR:L reflects that the attacker must already hold permission to define classpath entries. … 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 | Upgrade the Jenkins Script Security Plugin past 1415.v9a_f9b_3a_c253d to the fixed version named in the Jenkins Security Advisory 2026-09-16, SECURITY-3932 (https://www.jenkins.io/security/advisory/2026-09-16/#SECURITY-3932) - the exact patched version number is not enumerated in the supplied data, so confirm it against that advisory before scheduling the update; the plugin can be updated through Jenkins' own Plugin Manager. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Jenkins instances running Script Security Plugin version 1415.v9a_f9b_3a_c253d or earlier and restrict the permission to define classpath entries to only essential, trusted administrators. …
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External POC / Exploit Code
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