CVE-2026-93755 · Package
NO FIX YET · SEE WHAT TO DO
The Happyforms plugin for WordPress stores the client IP taken unvalidated from HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR headers on form submissions, then prints it unescaped in the admin submission screen. An unauthenticated attacker can plant script that runs in the browser of an administrator who opens the submission.
first public Nov 7, 2026 · 1 source
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Sites running the Happyforms plugin at version 1.38.9 or earlier that accept public form submissions. The risk lands on administrators who review submissions in the WordPress admin, so sites with no public forms or no admin reviewing submissions carry less exposure. unknown whether a fixed version exists.
Not affected if no-public-forms, plugin-not-installed
Who cares happyforms, self-hosted, wordpress
1.38.9 or lower in the WordPress admin plugin listhappyforms_get_client_ip function in the plugin's source filesThe Happyforms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via spoofable client IP headers in versions up to, and including, 1.38.9. This is due to the happyforms_get_client_ip() function reading raw HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR request headers without any validation or sanitization, storing the value as post meta ('client_ip') via update_post_meta() during unauthenticated form submissions, and later echoing it in the admin submission edit screen's Details metabox without output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user (typically an administrator reviewing a submission) accesses an injected page.
This page as .md · .json · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
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