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b2evolution CMSb2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key

Risk 80
Severity
9.2
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

b2evolution CMS versions 6.7.8 through 7.2.5 contain an incomplete fix for CVE-2016-8901 where the serialized-array object check in paramcheckserializedarray() fails to reject payloads with negative integer array keys. Unauthenticated attackers can submit crafted serialized PHP objects via POST requests to htsrv/callplugin.php that bypass validation and reach unserialize(), instantiating arbitrary PHP objects with attacker-chosen properties that may enable code execution if suitable POP gadget chains exist.

First published (updated )
CVE-2026-76834

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