CVE-2025-9129

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

CVSS 6.4 MEDIUMEPSS 0.2%CWE-79

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.4EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

03 Oct 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Affected products

odude · Flexi – Guest Submit

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References

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