CVE-2026-70553: MaxSite CMS Unauthenticated RCE via Install Endpoint
MaxSite CMS contains a remote code execution vulnerability that allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file by submitting crafted POST requests to the install endpoint after installation is complete. Attackers can supply a malicious dbdbprefix value containing a single quote to break out of a PHP string literal in application/config/database.php, appending attacker-controlled PHP statements that are executed by the web server on every subsequent request, resulting in persistent unauthenticated remote code execution as the web-server process user.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-70553?
CVE-2026-70553 has a critical severity rating of 9.3.
How do I fix CVE-2026-70553?
To mitigate CVE-2026-70553, ensure that the MaxSite CMS is updated to a version that addresses this vulnerability.
What types of attacks are possible with CVE-2026-70553?
CVE-2026-70553 allows unauthenticated attackers to execute arbitrary PHP code remotely.
What are the implications of CVE-2026-70553?
Exploitation of CVE-2026-70553 can lead to full system compromise through remote code execution.
Which software is affected by CVE-2026-70553?
CVE-2026-70553 affects MaxSite CMS, specifically the installation endpoint.