CVE-2025-9129CWE-79cross-site-scripting

CVE-2025-9129

Medium · published October 3, 2025

CVSS v3.1

6.4

EPSS

Percentile

14.4

In the wild

Unconfirmed

What it is

The Flexi plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin for WordPress's flexi-form-tag shortcode in all versions up to, and including, 4.28 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The record

Technical detail

CVSS v3.1: 6.4 · MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0: Not supplied
EPSS: 0.00241 · 14.4th percentile
Weakness: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published: 2025-10-03T16:15Z

References (3)

https://plugins.trac.wordpress.org/browser/flexi/trunk/includes/class-flexi-form.php#L572 · [email protected]https://wordpress.org/plugins/flexi/#developers · [email protected]https://www.wordfence.com/threat-intel/vulnerabilities/id/ccfd4949-07ae-48b6-9aa2-82fd6b1bf692?source=cve · [email protected]

EPSS history

Timeline

03 OCT 11:17Z
Flexi <= 4.28 - Authenticated (Contributor+) Stored Cross-Site Scripting via flexi-form-tag Shortcode
cvelistv5