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CVE-2026-70552

MaxSite CMS 109.5 Unauthenticated AJAX Dispatcher Bypass via ajax.php

CVSS 4.0 9.3 CRITICALCVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-70552

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-70552

Published

MaxSite CMS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "affected",
                    "vendor": "MaxSite",
                    "product": "MaxSite CMS",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0.78",
                            "versionType": "custom",
                            "lessThanOrEqual": "109.5"
                        },
                        {
                            "status": "unaffected",
                            "version": "109.6",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON