Vulnerability · Published Sep 11, 2026 · Assigned by VulnCheck
CVE-2026-89145Flextype CMS 0.9.9 through 1.0.0-alpha.3 Stored XSS via Plugin Directory
Medium 4.2
In plain English
A medium-severity cross-site scripting in flextype from flextype. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Severity (CVSS 3.1)4.2Medium
Exploit odds (30 days)0.2%top 92.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
References
- GitHub Issue #597 issue-tracking
- https://github.com/flextype/flextype product
- Plugins.php getValidPluginsDependencies() unescaped output technical-description
- VulnCheck Advisory: Flextype CMS 0.9.9 through 1.0.0-alpha.3 Stored XSS via Plugin Directory third-party-advisory