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Vulnerabilities CVE-2026-70554

CVE-2026-70554

Critical
Open
TLP:CLEAR

MaxSite CMS Unauthenticated PHP Object Injection via maxsite_comuser Cookie

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Description

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.

Details

CVSS Score
9.3
EPSS Score
0.85%

55th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence
90%
Published
Aug 4, 2026
Last Modified
Aug 5, 2026
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