CVE-2026-39275 Cross-site scripting in n/a
A remote attacker can execute arbitrary code via Cross Site Scripting in Cockpit CMS components, requiring an upgrade to secure the application.
- 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
- None listed
What is CVE-2026-39275?
CVE-2026-39275 is a medium-severity cross-site scripting vulnerability in n/a, published on 26 Aug 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
Cross Site Scripting vulnerability in Cockpit CMS v.2.13.5 and before allows a remote attacker to execute arbitrary code via the item.php, field-select.js and tags.js components
Weakness: CWE-79
Which versions are affected by CVE-2026-39275?
How do I fix CVE-2026-39275?
No fix has been published for CVE-2026-39275 yet. Limit exposure of the affected software until one is available.
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-2026-39275 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39275 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-9xcw-6vw9-p38w, UBUNTU-CVE-2026-39275.