---
id: CVE-2026-70552
title: MaxSite CMS 109.5 Unauthenticated AJAX Dispatcher Bypass via ajax.php
summary: >-
  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-e…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-306
vendor: MaxSite
product: MaxSite CMS
affected:
  - cms >= 0.78 <= 109.5
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-08-05T13:49:46.903584Z'
published: '2026-08-04'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T14:18:35.417Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-70552'
references:
  - url: 'https://github.com/maxsite/cms'
    label: Product Repository
  - url: 'https://max-3000.com/page/maxsite-cms-109-6'
    label: Patch Commit
  - url: >-
      https://www.vulncheck.com/advisories/maxsite-cms-unauthenticated-ajax-dispatcher-bypass-via-ajax-php
tags:
  - cve.org
epss: 0.00566
epssPercentile: 0.45765
ingestedAt: '2026-09-24T15:45:56.717Z'
---

## Overview

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

- `cms >= 0.78 <= 109.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.