Vulnerability · Published Aug 4, 2026 · Assigned by VulnCheck

CVE-2026-70552MaxSite CMS 109.5 Unauthenticated AJAX Dispatcher Bypass via ajax.php

Critical 9.8

In plain English

A critical-severity missing authentication in MaxSite CMS from MaxSite. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.8%top 42.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
MaxSite	MaxSite CMS	0.78 – through 109.5

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Product Repository product
Patch Commit patch
https://www.vulncheck.com/advisories/maxsite-cms-unauthenticated-ajax-dispatcher-bypass-via-ajax-php third-party-advisory