CVE-2026-70553: MaxSite CMS Unauthenticated RCE via Install Endpoint
MaxSite · MaxSite CMS
Vendor fix available · Affected: MaxSite CMS · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 70% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- MaxSite · MaxSite CMSfrom 105.2 up to and including 109.5
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- MaxSite
- Published
- August 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-70553 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.