CVE-2026-89145CWE-79cross-site-scripting

CVE-2026-89145

Medium · published September 11, 2026

CVSS v3.1
4.2
EPSS
0%
Percentile
7.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.2 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
2.4 · CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS
0.00179 · 7.1th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-11T06:18Z
References (4)
https://github.com/flextype/flextype · [email protected]https://github.com/flextype/flextype/blob/aea4ead8c449ea5517ed53b6dcbd28b0a528ad9d/src/flextype/core/Plugins.php#L345 · [email protected]https://github.com/flextype/flextype/issues/597 · [email protected]https://www.vulncheck.com/advisories/flextype-cms-0.9.9-through-1.0.0-alpha.3-stored-xss-via-plugin-directory · [email protected]
EPSS history
Timeline
  • 12 SEP 03:22Z
    EPSS moved — → 0%
    epss
  • 11 SEP 01:14Z
    Flextype CMS 0.9.9 through 1.0.0-alpha.3 Stored XSS via Plugin Directory
    cvelistv5