CVE-2026-84659
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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Exploitation outlook
- Low exploitation risk0.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
Advisory coverage (3)
- high[NEW] [high] Jenkins: Multiple Vulnerabilitiescert-bund · 2026-09-03
- mediumCVE-2026-84659: Jenkins Script Security Plugin 1412.v7737b_3405f86 and earlier does not enforce a permission c…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-2026-84659)