CVE-2026-84651
A remote, anonymous attacker can exploit multiple vulnerabilities in Jenkins and various plugins to disclose or manipulate data, conduct cross-site scripting (XSS), execute arbitrary code, or take over another user's session.
CSIRTS triage
- What
- Multiple vulnerabilities in Jenkins and plugins allow remote anonymous attackers to disclose or manipulate data, conduct XSS, execute arbitrary code, and hijack user sessions.
- Who is affected
- Jenkins instances, particularly those exposed to untrusted networks, are affected; anonymous exploitation is possible.
- Urgency
- High severity; unauthenticated code execution on CI/CD infrastructure poses critical risk to software supply chain.
- Action
- Update Jenkins and all plugins to patched versions addressing CVE-2026-84645 through CVE-2026-84652.
AI-assisted analysis generated from the source advisory — verify against the original.
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Advisory coverage (4)
- high[NEW] [high] Jenkins: Multiple Vulnerabilitiescert-bund · 2026-09-03
- unknownJenkins Multiple Vulnerabilitieshkcert · 2026-09-03
- mediumCVE-2026-84651: In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the REST API and CLI endpoints for upda…nvd · 2026-09-02
- unknownJenkins Security Advisory 2026-09-02jenkins · 2026-09-02
External references
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[](https://www.csirts.com/cve/CVE-2026-84651)