CVE-2026-70553 Details
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.
A remote code execution vulnerability exists in MaxSite CMS versions 105.2 through 109.5. This vulnerability allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file. Exploitation involves sending crafted POST requests to the install endpoint after the initial installation. Attackers can manipulate the db_dbprefix value to escape a PHP string literal in the database configuration file, appending malicious PHP code that is executed by the web server on each request. This results in persistent, unauthorized remote code execution as the user of the web server process.
Users are advised to update MaxSite CMS to version 109.6, which addresses this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Aug 4, 2026CISA-ADP
Assessed Aug 5, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/maxsite/cms | [email protected] | Source CodeVendor |
| https://max-3000.com/page/maxsite-cms-109-6 | [email protected] | Release NotesVendor |
| https://www.vulncheck.com/advisories/maxsite-cms-unauthenticated-rce-via-install-endpoint | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| MaxSite CMS | <= 109.5 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 5, 2026 | CVE Modified | CISA-ADP |
| Aug 4, 2026 | New CVE Received | [email protected] |