CVE-2026-4666

Description

The wpForo Forum plugin for WordPress is vulnerable to unauthorized modification of data due to the use of `extract($args, EXTR_OVERWRITE)` on user-controlled input in the `edit()` method of `classes/Posts.php` in all versions up to, and including, 2.4.16. The `post_edit` action handler in `Actions.php` passes `$_REQUEST['post']` directly to `Posts::edit()`, which calls `extract($args, EXTR_OVERWRITE)`. An attacker can inject `post[guestposting]=1` to overwrite the local `$guestposting` variable, causing the entire permission check block to be skipped. The nonce check uses a hardcoded `wpforo_verify_form` action shared across all 8 forum templates, so any user who can view any forum page obtains a valid nonce. This makes it possible for authenticated attackers, with Subscriber-level access and above, to edit the title, body, name, and email fields of any forum post, including posts in private forums, admin posts, and moderator posts. Content passes through `wpforo_kses()` which strips JavaScript but allows rich HTML.

References

• https://plugins.trac.wordpress.org/browser/wpforo/tags/2.4.16/classes/Actions.php#L773
• https://plugins.trac.wordpress.org/browser/wpforo/tags/2.4.16/classes/Posts.php#L283
• https://plugins.trac.wordpress.org/browser/wpforo/tags/2.4.16/classes/Posts.php#L285
• https://plugins.trac.wordpress.org/browser/wpforo/tags/2.4.16/includes/functions.php#L532
• https://plugins.trac.wordpress.org/changeset?old_path=%2Fwpforo/tags/2.4.16&new_path=%2Fwpforo/tags/2.4.17