Stored Cross-Site Scripting Vulnerability in Flexi Plugin for WordPress
CVE-2025-9129

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Flexi – Guest Submit
Vendor
CVE Published:
3 October 2025

What is CVE-2025-9129?

The Flexi Plugin for WordPress is prone to a Stored Cross-Site Scripting vulnerability due to inadequate input sanitization and output escaping for user-supplied attributes within the flexi-form-tag shortcode. This flaw affects all versions up to and including 4.28. Authenticated attackers with contributor-level access or higher can exploit this issue to inject arbitrary web scripts into WordPress pages. These scripts execute in the browsers of users who access the compromised pages, potentially leading to unauthorized actions or data theft.

Affected Version(s)

Flexi – Guest Submit * <= 4.28

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/flexi/trunk/in...
https://wordpress.org/plugins/flexi/#developers

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Peter Thaleikis
JSON
.
CVE-2025-9129 : Stored Cross-Site Scripting Vulnerability in Flexi Plugin for WordPress