CVE-2026-70552 MaxSite CMS 109.5 Unauthenticated AJAX Dispatcher Bypass via ajax.php
Unauthenticated attackers can bypass authentication in MaxSite CMS to access admin-only AJAX endpoints, allowing unauthorized modification of data and privileged actions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-70552?
CVE-2026-70552 is a critical authentication bypass vulnerability in MaxSite CMS, published on 4 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-306
Which versions are affected by CVE-2026-70552?
How do I fix CVE-2026-70552?
No fix has been published for CVE-2026-70552 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-70552 being exploited?
There is no known exploitation of CVE-2026-70552 in the wild and no public exploit code.
Sources
Also known as GHSA-r998-r395-678g.