CVE-2026-84652 Auth bypass in Jenkins
Attackers can hijack user sessions by exploiting missing session rotation during 'remember me' authentication, leading to unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-84652?
CVE-2026-84652 is a high-severity authentication bypass vulnerability in Jenkins Jenkins, published on 2 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, Jenkins does not rotate the session when a user is authenticated via the "remember me" cookie, allowing attackers able to serve content on the same site as Jenkins to set a known session cookie in the victim's browser, which after the victim authenticates via the "remember me" cookie, grants the attacker access to Jenkins as that user.
Weakness: CWE-384
Which versions are affected by CVE-2026-84652?
1 open source package ship an affected version, including jenkins. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
jenkins Bitnami | All versions | 2.568.3, 2.580.0 |
Products include Jenkins Jenkins.
How do I fix CVE-2026-84652?
Upgrade jenkins to a fixed version for your release line: 2.568.3 or 2.580.0.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-84652 being exploited?
There is no known exploitation of CVE-2026-84652 in the wild and no public exploit code.
Other vulnerabilities in Jenkins Jenkins
- CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal
- CVE-2018-1000861 Jenkins Stapler Web Framework Deserialization of Untrusted Data
- CVE-2017-1000353 Jenkins Remote Code Execution
- CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure
- CVE-2021-21690 Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
Sources
Also known as BIT-jenkins-2026-84652, GHSA-42rh-v5qm-8p5w, MINI-6xvq-q6vm-j2m2, MINI-jgx2-jxhc-3v7j, MINI-q5mp-q372-5q59, MINI-v42j-hq2j-c73r and 3 more.