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Affected Environment
Script Security, Pipeline, GitLab, Gradle, Warnings, Coverage, and several other Jenkins plugins across installations.
Threat Overview
Multiple vulnerabilities enable sandbox bypass, code execution, SSRF, XSS, and file-system manipulation across plugins.
Exposure Timeline
Disclosed 16 September 2026; fixed plugin versions are available now for all listed vulnerabilities.
Attack Surface
Sandboxed Pipeline scripts, plugin REST APIs, and webhook endpoints reachable by users with configure permissions.
Technical Root Cause
Groovy sandbox bypass flaws, TOCTOU race conditions, and missing input validation across multiple plugins.
Exploitation Pathway
Attackers with script or configure permissions bypass sandbox protections to execute code on the controller.
Operational Impact
Arbitrary code execution on the Jenkins controller JVM, credential theft, and stored cross-site scripting.
Strategic Impact
High risk across all organisation sizes given Jenkins' central role in CI/CD build pipelines.
Required Mitigation
Update Script Security Plugin and all twelve other listed plugins to their fixed versions.
Incident Response Guidance
Audit Item/Configure permission grants and review Pipeline scripts for suspicious sandbox bypass attempts.
References
Jenkins Security Advisory, 16 September 2026.
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