CVE-2026-86834
UnknownSummary
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.
Risk Assessment
An unauthenticated attacker can access sensitive data such as correlation identifiers and cookies, potentially leading to privacy breaches or further attacks.
Recommendation
Update the MetForm plugin to version 4.3.1 or later to ensure proper access restriction to the debug file.
Other vulnerabilities in MetForm
See all- 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-2026-103339Medium
Metform plugin has a stored XSS vulnerability due to improper input neutralization during web page generation. Affects versions up to 4.3.0.
- 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)
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, allowing unauthenticated attackers to read upstream API response data, including correlation identifiers and cookies.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS