CVE-2026-84648 Cross-site scripting in Jenkins
Attackers controlling agent processes can inject malicious scripts into Jenkins system logs, leading to stored XSS and potential session hijacking.
- 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-2026-84648?
CVE-2026-84648 is a high-severity cross-site scripting vulnerability in Jenkins 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 Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the system log viewer does not escape log record metadata (source, level, and timestamp) resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers in control of agent processes.
Weakness: CWE-79
Which versions are affected by CVE-2026-84648?
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-2026-84648?
Upgrade jenkins to a fixed version for your release line: 2.568.3 or 2.580.0.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-84648 being exploited?
There is no known exploitation of CVE-2026-84648 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-2026-84648, GHSA-qgwr-f9q8-fxgq, MINI-4274-mx59-jx46, MINI-44v2-762f-cgrg, MINI-8fvx-738p-8h7r, MINI-cg65-frpq-mrwj and 3 more.