CVE-2026-103339
MediumCVSS 6.5Summary
Metform plugin has a stored XSS vulnerability due to improper input neutralization during web page generation. Affects versions up to 4.3.0.
Risk Assessment
An attacker can inject malicious script that executes in the user's browser, potentially leading to data theft or session hijacking.
Recommendation
Update the plugin to the latest version and apply input filtering mechanisms.
Other vulnerabilities in Metform
See all- CVE-2026-86834Unknown
The MetForm WordPress plugin before 4.3.1 does not properly restrict access to a debug file it writes to the web root on every form submission when its HubSpot Forms integration is enabled. This allows unauthenticated attackers to read upstream API response data, including correlation identifiers and cookies.
- CVE-2026-86832Unknown
The MetForm WordPress plugin before 4.3.1 does not properly restrict access to form submission data, allowing unauthenticated attackers to view submitter information through the REST API.
- CVE-2026-18100Medium
The MetForm 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.
Original NVD description (English source)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Wpmet Metform metform allows Stored XSS.This issue affects Metform: from n/a through 4.3.0.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS