CVE-2026-71294
ÉlevéQu'est-ce que CVE-2026-71294 ?
Cotonti CMS's Comments plugin deserializes user-supplied data without restricting the classes that may be instantiated. In plugins/comments/controllers/actions/CreateAction.php, a `ci` POST parameter obtained via `cot_import('ci', 'P', 'TXT')` (trim-only sanitization) is passed to `unserialize(base64_decode($ci))` with no `allowed_classes` restriction, reachable by any member with write access to comments (the default `Auth_members => 'RW'` setting in plugins/comments/comments.setup.php). In plugins/comments/controllers/actions/EditAction.php, a `cb` parameter is similarly deserialized via `unserialize(base64_decode($this->comeback))` in prepareComeBack(), reachable by any member editing their own comment. Because unserialize() is called without allowed_classes, an attacker can construct a serialized PHP object of any class loaded by Cotonti (a PHP Object Injection primitive). This was demonstrated in practice using Cotonti's own MySQL_cache class: a crafted serialized MySQL_cache object, once deserialized and later garbage-collected, triggers its __destruct()->flush() chain, causing an attacker-controlled INSERT INTO cot_cache with attacker-chosen row values — confirming genuine POP-chain exploitation, with further impact (including potential RCE) contingent on other gadget chains available in a given Cotonti installation's loaded classes. A third sink in DeleteAction.php contains the identical unserialize() pattern but is gated behind an admin-only authorization check and is not reachable by ordinary members.
CVSS Vector Breakdown
CVSS 3.1Exploitable remotely over the network without requiring access to the local system.
No special conditions required. Exploit can be performed reliably and repeatedly.
Basic user account required (e.g. standard login without admin rights).
No user interaction required. Exploit runs without any victim action.
Exploiting the vulnerability only affects the vulnerable component itself.
Complete loss of confidentiality. All data on the component may be exposed.
Attacker can modify some data, but scope or consequence is limited.
Reduced performance or intermittent outages, but service remains available.
FAQ
CVE-2026-71294 a un score CVSS de 7.6/10, évalué comme High. Il s'agit d'une vulnérabilité de haute gravité qui doit être corrigée dès que possible.
Le CVSS (Common Vulnerability Scoring System) évalue la gravité des vulnérabilités de 0,0 à 10,0. CVE-2026-71294 obtient 7.6/10 (High). Les scores de 9,0–10,0 sont Critiques, 7,0–8,9 Élevés, 4,0–6,9 Moyens et inférieurs à 4,0 Faibles.
La liste des appareils confirmés comme étant affectés par CVE-2026-71294 est indiquée dans la section "Appareils affectés" ci-dessus. Comparez votre version de firmware avec l'avis de sécurité du fournisseur et appliquez le dernier correctif.
Appliquez la dernière mise à jour du firmware ou du logiciel du fournisseur. Consultez la section Références ci-dessus pour les avis officiels et les notes de correctif. Si aucun correctif n'est disponible, envisagez de désactiver la fonctionnalité affectée ou d'isoler l'appareil des réseaux non fiables.