CVE-2026-4666 Missing authorization in wpForo Forum
Authenticated subscribers can arbitrarily modify any forum post, including private and admin posts, due to missing authorization checks in the wpForo Forum plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4666?
CVE-2026-4666 is a medium-severity missing authorization vulnerability in tomdever wpForo Forum, published on 17 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-4666?
How do I fix CVE-2026-4666?
No fix has been published for CVE-2026-4666 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-4666 being exploited?
There is no known exploitation of CVE-2026-4666 in the wild and no public exploit code.
Sources
Also known as GHSA-gq2v-mwv7-cvm2.