CVE-2026-70552
MaxSite CMS 109.5 Unauthenticated AJAX Dispatcher Bypass via ajax.php
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.
INFO
Published Date :
Aug. 4, 2026, 8:16 p.m.
Last Modified :
Aug. 4, 2026, 8:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update MaxSite CMS to a non-vulnerable version.
- Apply vendor-supplied patches immediately.
- Review access controls for AJAX endpoints.
- Monitor for unauthorized endpoint access.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-70552.
| URL | Resource |
|---|---|
| https://github.com/maxsite/cms | |
| https://max-3000.com/page/maxsite-cms-109-6 | |
| https://www.vulncheck.com/advisories/maxsite-cms-unauthenticated-ajax-dispatcher-bypass-via-ajax-php |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-70552 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-70552
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-70552 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-70552 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 04, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'MaxSite', 'product': 'MaxSite CMS', 'versions': [{'status': 'affected', 'version': '0.78', 'versionType': 'custom', 'lessThanOrEqual': '109.5'}, {'status': 'unaffected', 'version': '109.6', 'versionType': 'custom'}], 'defaultStatus': 'affected'}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-306 Added Reference https://github.com/maxsite/cms Added Reference https://max-3000.com/page/maxsite-cms-109-6 Added Reference https://www.vulncheck.com/advisories/maxsite-cms-unauthenticated-ajax-dispatcher-bypass-via-ajax-php