PT-2025-40483 · WordPress · Flexi

Peter Thaleikis · Published 2025-10-03 · Updated 2025-10-03 · CVE-2025-9129

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Flexi plugin for WordPress versions up to and including 4.28

Description The Flexi plugin for WordPress is susceptible to Stored Cross-Site Scripting through the flexi-form-tag shortcode. Insufficient input sanitization and output escaping on user-supplied attributes allow authenticated attackers with contributor-level access or higher to inject arbitrary web scripts into pages. These scripts will execute when a user accesses the injected page.

Recommendations Update the Flexi plugin to a version later than 4.28.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2025-9129

Affected Products

Flexi

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2025-9129 · Security Note
• https://wordfence.com/threat-intel/vulnerabilities/id/ccfd4949-07ae-48b6-9aa2-82fd6b1bf692?source=cve · Note
• https://plugins.trac.wordpress.org/browser/flexi/trunk/includes/class-flexi-form.php#L572 · Note
• https://twitter.com/VulmonFeeds/status/1974164863556501538 · Twitter Post
• https://wordpress.org/plugins/flexi/#developers · Note
• https://twitter.com/CVEnew/status/1974076246670663815 · Twitter Post