The MetForm – Contact Form, Survey, Quiz, & Custom Form Builder for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'mf_form_id' Widget Setting in all versions up to, and including, 4.1.8 due to insufficient input sanitization and output escaping. 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. The payload bypasses Elementor's save-time wp_kses_post filter because it contains no HTML tags, and MetForm's own str_replace transformation of script tags into JavaScript template literal expressions provides an additional delivery path.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 8
https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/controls/form-pic…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/utils/util.php#L6…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/widgets/form.php#…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/controls/form-pic…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/utils/util.php#L6…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/widgets/form.php#…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset?reponame=&new=3639278%40metform%2F…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/976f1f01-ad5d-413e-a2…
security@wordfence.com