CVE-2026-49400

October CMS (System module) prior to v3.7.17 and v4.2.21 is affected by a PHP object injection vulnerability in the backend SessionMaker trait, which stored widget session state as base64(serialize(...)) and deserialized it with unserialize() without an allowed_classes restriction. Exploitation r...

GHSA-9369-69WJ-7M2F YesWiki Vulnerable to Authenticated PHP Object Injection in BazarImportAction via unserialize

Details Sink tools/bazar/services/CSVManager.php line 372-399: public function importEntryarray $importedEntries, string $formId: ?array if !$this-importdone // ... foreach $importedEntries as $entry $entry = unserializebase64decode$entry; // false argument; arbitrary classes are instantiated. Th...