CVE-2026-70554 — Vulnerability intelligence
MaxSite — MaxSite CMS
Published:
- CVSS
- 9.3
- CISA KEV
- Not listed; not proof of no exploitation
Original source text (not a translation)
MaxSite CMS contains a PHP object injection vulnerability that allows unauthenticated attackers to execute arbitrary code by passing attacker-controlled serialized data in the maxsite_comuser cookie directly to unserialize() without validation or class allowlisting. Attackers can craft a malicious serialized PHP object payload delivered in a single HTTP request to trigger magic methods during object graph reconstruction, enabling property-oriented programming attacks or remote code execution via available gadget chains such as those targeting SoapClient or Imagick extensions.