MaxSite CMS up to 109.5 Install Endpoint database.php db_dbprefix injection

Summaryinfo

A vulnerability classified as critical has been found in MaxSite CMS up to 109.5. This affects an unknown part of the file application/config/database.php of the component Install Endpoint. The manipulation of the argument db_dbprefix leads to injection. This vulnerability is uniquely identified as CVE-2026-70553. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in MaxSite CMS up to 109.5. It has been rated as critical. This issue affects some unknown processing of the file application/config/database.php of the component Install Endpoint. The manipulation of the argument db_dbprefix with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-70553 since 08/04/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1055 for this issue.

By approaching the search of inurl:application/config/database.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 109.6 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Content Management System

Vendor

• MaxSite

Name

• CMS

Version

• 109.0
• 109.1
• 109.2
• 109.3
• 109.4
• 109.5

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion