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Vulnerabilities CVE-2026-70553

CVE-2026-70553

Critical
Open
TLP:CLEAR

MaxSite CMS Unauthenticated RCE via Install Endpoint

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Description

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 db_dbprefix 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.

Details

CVSS Score
9.3
EPSS Score
0.88%

55.9th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence
90%
Published
Aug 4, 2026
Last Modified
Aug 5, 2026
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