CVE-2026-84649
CVE-2026-84649
In Stapler 1839.ved17667b_a_eb_5 through 2107.v8dfcb_e8ed317 (both inclusive), except 2088.2093.vd7c3e58008a_6, included in Jenkins 2.447 through 2.579 (both inclusive), LTS 2.452.1 through 2.568.2 (both inclusive), an HTTP endpoint serving dynamically generated JavaScript resources embeds the user's cross-site request forgery (CSRF) token (crumb) as a string literal, allowing attackers with control over a page hosted on the same site as Jenkins to obtain a valid crumb for the targeted user's session and perform actions on their behalf.
Vulnerability class: CSRF (Cross-Site Request Forgery)
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Weakness classification (CWE)
References
- jenkinsci-cert@googlegroups.com (vendor-advisory)
Frequently asked questions
- What is CVE-2026-84649?
- CVE-2026-84649 is a high-severity vulnerability, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2026-09-02.
- How severe is CVE-2026-84649?
- High severity. CVSS v3 base score is 8.8 out of 10.