Session action forgery via exposed CSRF crumb
Published Sep 2, 2026 · Updated Sep 2, 2026
Cross-origin CSRF token exposure in Jenkins 2.447 through 2.579 allows remote attackers to act as a targeted user. Stapler’s dynamic JavaScript endpoint places the authenticated user’s crumb directly in a response string literal that a same-site page can load. Exploitation requires control of content on the same site and an authenticated victim session; exposed actions run with that user’s Jenkins permissions.
Summary
What happened
Cross-origin CSRF token exposure in Jenkins 2.447 through 2.579 allows remote attackers to act as a targeted user. Stapler’s dynamic JavaScript endpoint places the authenticated user’s crumb directly in a response string literal that a same-site page can load. Exploitation requires control of content on the same site and an authenticated victim session; exposed actions run with that user’s Jenkins permissions.
The record
- CVE
- CVE-2026-84649
- Published
- Sep 2, 2026
- Updated
- Sep 2, 2026
- Vendor
- Jenkins Project
- Product
- Jenkins
- Classifications
- CWE-352
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 2, 2026CVE publishedPublication date reported by the CVE source.
- Sep 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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