CVE-2025-9129 - Flexi <= 4.28 - Authenticated (Contributor+) Stored Cross-Site Scripting via flexi-form-tag Shortcode

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MEDIUM

Flexi <= 4.28 - Authenticated (Contributor+) Stored Cross-Site Scripting via flexi-form-tag Shortcode

Published Oct 3, 2025

6.4

MEDIUM

CVSS 3.1

EPSS 0.24%

Description

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.

Affected products

Vendor Odude Product Flexi – Guest Submit Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <=4.28

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Odude

Flexi – Guest Submit

unaffected

Version	Status	Constraints
0	affected	<=4.28

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-79

Cross-site Scripting (XSS)

References (3)

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