CVE-2026-7635
Vulnérabilité élevée dans coreActivity: Activity Logging for WordPress (gdragon)
Description
The coreActivity: Activity Logging for WordPress plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.0. This is due to the plugin failing to validate or strip PHP serialization syntax from the User-Agent HTTP header before storing it in the logmeta table, and subsequently calling `maybe_unserialize()` on every retrieved `meta_value` in `query_metas()` without verifying the data was originally serialized by the application. This makes it possible for unauthenticated attackers to inject a crafted PHP serialized payload via the User-Agent header during any logged event (such as a failed login attempt), which, when an administrator views the Logs page, is deserialized and passed to `DeviceDetector::setUserAgent()`, triggering a Fatal TypeError that creates a persistent Denial of Service condition blocking administrator access to the Logs page entirely.
Gravité et risque d'exploitation
CVE-2026-7635 obtient un score CVSS de 8.1/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.83 %, ce qui la place devant 56.9 % des CVE référencées.
Que faire ?
- Vérifiez si coreActivity: Activity Logging for WordPress (versions 0, <=3.0) 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/59f30135-6dd9-4367-90a9-a10ad491357d?source=cve
- https://plugins.trac.wordpress.org/browser/coreactivity/trunk/vendor/dev4press/library/dev4press/wordpress/admin/Table.php#L290
- https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/vendor/dev4press/library/dev4press/wordpress/admin/Table.php#L290
- https://plugins.trac.wordpress.org/browser/coreactivity/trunk/core/log/Core.php#L252
- https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/log/Core.php#L252
- https://plugins.trac.wordpress.org/browser/coreactivity/trunk/vendor/dev4press/library/dev4press/core/plugins/DBLite.php#L268
- https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/vendor/dev4press/library/dev4press/core/plugins/DBLite.php#L268
- https://plugins.trac.wordpress.org/browser/coreactivity/trunk/core/table/Logs.php#L161
- https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/table/Logs.php#L161
- https://plugins.trac.wordpress.org/browser/coreactivity/trunk/core/log/Device.php#L35
- https://plugins.trac.wordpress.org/browser/coreactivity/tags/3.0/core/log/Device.php#L35
- https://github.com/dev4press/coreactivity/pull/3/changes/1f09331d66de7cf4bba9b6e396b0d4e7597fcde2
