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CVE-2026-70554 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/maxsite/cms	[email protected]	Source CodeVendor
https://max-3000.com/page/maxsite-cms-109-6	[email protected]	Release NotesVendor
https://www.vulncheck.com/advisories/maxsite-cms-unauthenticated-php-object-injection-via-maxsite-comuser-cookie	[email protected]	AdvisoryRemedy

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-502	Deserialization of Untrusted Data	[email protected]

Affected Products

Product	Versions
MaxSite CMS	>= 0.78, <= 109.5
CPE cpe:2.3:a:maxsite:cms:::::::: Remediation Upgrade: 109.6moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Aug 5, 2026	CVE Modified	CISA-ADP
Aug 4, 2026	New CVE Received	[email protected]