CVE-2026-84649 Cross-site request forgery in Jenkins
Attackers can steal CSRF tokens from Jenkins JavaScript endpoints to perform unauthorized actions on behalf of users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-84649?
CVE-2026-84649 is a high-severity vulnerability in Jenkins, published on 2 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-352
Which versions are affected by CVE-2026-84649?
1 open source package ship an affected version, including jenkins.
| Package | Affected | Fixed in |
|---|---|---|
jenkins Bitnami | From 2.447.0 | 2.568.3, 2.580.0 |
How do I fix CVE-2026-84649?
Upgrade jenkins to a fixed version for your release line: 2.568.3 or 2.580.0.
Is CVE-2026-84649 being exploited?
There is no known exploitation of CVE-2026-84649 in the wild and no public exploit code.
Sources
Also known as BIT-jenkins-2026-84649, GHSA-hxvq-fvg2-gh6m, MINI-2q2x-qq6c-58mj, MINI-5c2x-66g3-7pf5, MINI-8572-634m-84mp, MINI-h2c6-r247-q7x5 and 3 more.