MaxSite CMS up to 109.5 AJAX Dispatcher ajax.php X-Requested-With state issue

Summaryinfo

A vulnerability was found in MaxSite CMS up to 109.5 and classified as critical. The impacted element is an unknown function of the file ajax.php of the component AJAX Dispatcher. Executing a manipulation of the argument X-Requested-With can lead to state issue. This vulnerability is tracked as CVE-2026-70552. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in MaxSite CMS up to 109.5 and classified as critical. This vulnerability affects an unknown code of the file ajax.php of the component AJAX Dispatcher. The manipulation of the argument X-Requested-With with an unknown input leads to a state issue vulnerability. The CWE definition for the vulnerability is CWE-371. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

MaxSite CMS 109.5 and earlier contains an authentication bypass vulnerability in the AJAX dispatcher that allows unauthenticated attackers to access admin-gated endpoints by supplying any X-Requested-With header and requesting a base64-encoded path resolving to any *-ajax.php file in the codebase. Attackers can exploit this dispatcher bypass to reach privileged plugin endpoints without credentials, enabling actions such as manipulating poll states and vote counts, and amplifying the impact of any dangerous operation performed by admin-only ajax files across the plugin tree.

The advisory is available at github.com. This vulnerability was named CVE-2026-70552 since 08/04/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

By approaching the search of inurl:ajax.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 109.6 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• MaxSite

Name

• CMS

Version

• 109.0
• 109.1
• 109.2
• 109.3
• 109.4
• 109.5

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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