CVE-2026-5809
Vulnérabilité élevée dans wpForo Forum (tomdever)
Description
The wpForo Forum plugin for WordPress is vulnerable to Arbitrary File Deletion in versions up to and including 3.0.2. This is due to a two-step logic flaw: the topic_add() and topic_edit() action handlers accept arbitrary user-supplied data[*] arrays from $_REQUEST and store them as postmeta without restricting which fields may contain array values. Because 'body' is included in the allowed topic fields list, an attacker can supply data[body][fileurl] with an arbitrary file path (e.g., wp-config.php or an absolute server path). This poisoned fileurl is persisted to the plugin's custom postmeta database table. Subsequently, when the attacker submits wpftcf_delete[]=body on a topic_edit request, the add_file() method retrieves the stored postmeta record, extracts the attacker-controlled fileurl, passes it through wpforo_fix_upload_dir() which only rewrites legitimate wpforo upload paths and returns all other paths unchanged, and then calls wp_delete_file() on the unvalidated path. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete arbitrary files writable by the PHP process on the server, including critical files such as wp-config.
Gravité et risque d'exploitation
CVE-2026-5809 obtient un score CVSS de 7.1/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.63 %, ce qui la place devant 49.3 % des CVE référencées.
Que faire ?
- Vérifiez si wpForo Forum (versions <=3.0.2, 0) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://www.wordfence.com/threat-intel/vulnerabilities/id/0e46ac8d-89ee-4480-bb96-83f2044a4323?source=cve
- https://plugins.trac.wordpress.org/changeset/3503313/wpforo
- https://plugins.trac.wordpress.org/browser/wpforo/tags/3.0.2/classes/Actions.php#L746
- https://plugins.trac.wordpress.org/browser/wpforo/tags/3.0.2/classes/Actions.php#L761
- https://plugins.trac.wordpress.org/browser/wpforo/tags/3.0.2/classes/Posts.php#L1961
- https://plugins.trac.wordpress.org/browser/wpforo/tags/3.0.2/classes/PostMeta.php#L523
- https://plugins.trac.wordpress.org/browser/wpforo/tags/3.0.2/classes/PostMeta.php#L421
- https://plugins.trac.wordpress.org/browser/wpforo/tags/3.0.2/classes/PostMeta.php#L402
- https://plugins.trac.wordpress.org/browser/wpforo/tags/3.0.2/includes/functions.php#L2641
