# CVE-2026-4666

> Vulnerability · severity: **MEDIUM** (CVSS 6.5).

## 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.

## Key facts

- **CVE ID:** CVE-2026-4666
- **Published:** 2026-04-17
- **CVSS severity:** MEDIUM
- **CVSS base score:** 6.5
- **CWE codes:** CWE-862

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4666

## Citation

> AI Analytics. CVE-2026-4666. Retrieved 2026-07-11 from https://api.ai-analytics.org/cve/CVE-2026-4666. Derived from NIST NVD. Licensed CC0.

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