wpForo Forum <= 2.4.16 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Forum Post Modification via 'guestposting' Parameter
| CVE | CVE-2026-4666 |
|---|---|
| CVSS | 6.5 (Medium) |
| Publicly Published | April 16, 2026 |
| Last Updated | April 17, 2026 |
| Researcher |
Jared Reyes
|
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
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- wordpress.org
- ti.wordfence.io
- plugins.trac.wordpress.org
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Vulnerability Details for wpForo Forum
| Software Type | Plugin |
|---|---|
| Software Slug | wpforo (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 3.0.0, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in wpForo Forum
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