CVE-2025-9129
Flexi <= 4.28 - Authenticated (Contributor+) Stored Cross-Site Scripting via flexi-form-tag Shortcode
CVSS Score
6.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | odude |
| Product | flexi – guest submit |
| Published | Oct 3, 2025 |
| Last Updated | Apr 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
odude / Flexi – Guest Submit
0 ≤ 4.28
References
wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/ccfd4949-07ae-48b6-9aa2-82fd6b1bf692?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/flexi/trunk/includes/class-flexi-form.php#L572 wordpress.org: https://wordpress.org/plugins/flexi/#developers
Credits
Peter Thaleikis