CVE-2026-79363 Cross-site scripting in n/a
An authenticated administrator can inject JavaScript via the Branding Footer, leading to code execution in the web origin for users viewing affected pages.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-79363?
CVE-2026-79363 is a medium-severity cross-site scripting vulnerability in n/a, published on 9 Oct 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Cloudron 9.1.7 and 9.2 contain a stored cross-site scripting (XSS) vulnerability in the Branding Footer feature. An authenticated administrator can store crafted HTML containing JavaScript event handlers in the Footer setting. The stored value is rendered without sufficient sanitization on the public login / OpenID interaction page and in the System Event Log, causing attacker-controlled JavaScript to execute in the Cloudron web origin when an affected page is viewed.
Weakness: CWE-79
Which versions are affected by CVE-2026-79363?
How do I fix CVE-2026-79363?
No fix has been published for CVE-2026-79363 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-2026-79363 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79363 exists.
Sources
Also known as GHSA-39g8-j5g5-gfjq.