CVE-2026-89145 Flextype CMS 0.9.9 through 1.0.0-alpha.3 Stored XSS via Plugin Directory
Attackers with plugin directory write access can inject scripts via plugin names, leading to arbitrary code execution in user browsers.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-89145?
CVE-2026-89145 is a low-severity cross-site scripting vulnerability in flextype, published on 11 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Flextype CMS versions 0.9.9 through 1.0.0-alpha.3 fail to HTML-escape plugin directory names in the dependency error page rendered by getValidPluginsDependencies(). Attackers with write access to the plugins directory can create a plugin with HTML characters in its name to execute arbitrary scripts in users' browsers when dependency validation fails.
Weakness: CWE-79
Which versions are affected by CVE-2026-89145?
How do I fix CVE-2026-89145?
No fix has been published for CVE-2026-89145 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-2026-89145 being exploited?
There is no known exploitation of CVE-2026-89145 in the wild and no public exploit code.
Sources
Also known as GHSA-gqrp-6638-7vpg.