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

Quick assessment

Affected
MaxSite MaxSite CMS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MaxSite CMS是MAX个人开发者开源的一款内容管理系统及组件集合。 MaxSite CMS 109.5及之前版本存在授权问题漏洞，该漏洞源于AJAX调度器存在身份验证绕过漏洞，攻击者可通过提供任意X-Requested-With头并请求解析为代码库中任意*-ajax.php文件的base64编码路径，无需凭据即可访问管理端点，进而操纵投票状态和投票数。

CVSS 9.8 · Critical EPSS 0.57% · P46

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
MaxSite MaxSite CMS 0.78≤ 109.5 affected
109.6 unaffected
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I. Basic Information for CVE-2026-70552

Vulnerability Information
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Vulnerability Title
MaxSite CMS 109.5 Unauthenticated AJAX Dispatcher Bypass via ajax.php
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
MaxSite CMS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MaxSite CMS是MAX个人开发者开源的一款内容管理系统及组件集合。 MaxSite CMS 109.5及之前版本存在授权问题漏洞，该漏洞源于AJAX调度器存在身份验证绕过漏洞，攻击者可通过提供任意X-Requested-With头并请求解析为代码库中任意*-ajax.php文件的base64编码路径，无需凭据即可访问管理端点，进而操纵投票状态和投票数。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MaxSite MaxSite CMS 0.78 ~ 109.5 -

II. Public POCs for CVE-2026-70552

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 8090 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-70552

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Vendor Advisories for CVE-2026-70552 (2)

Vendor Pages for CVE-2026-70552 (1)

Same Patch Batch · MaxSite · 2026-08-04 · 3 CVEs total

CVE-2026-70553 9.8 CRITICAL MaxSite CMS Unauthenticated RCE via Install Endpoint
CVE-2026-70554 9.8 CRITICAL MaxSite CMS Unauthenticated PHP Object Injection via maxsite_comuser Cookie

IV. Related Vulnerabilities

Same product: MaxSite CMS
Same vendor: MaxSite
Same weakness: CWE-306

V. Comments for CVE-2026-70552

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