Summaryinfo

A vulnerability was found in pi-hole web up to 5.x. It has been rated as critical. This vulnerability affects the function exec of the file savesettings.php. This manipulation of the argument webtheme causes os command injection. This vulnerability appears as CVE-2026-33765. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in pi-hole web up to 5.x and classified as very critical. Affected by this vulnerability is the function exec of the file savesettings.php. The manipulation of the argument webtheme with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level ad and internet tracker blocking application. Versions prior to 6.0 have a critical OS Command Injection vulnerability in the savesettings.php file. The application takes the user-controlled $_POST['webtheme'] parameter and concatenates it directly into a system command executed via PHP's exec() function. Since the input is neither sanitized nor validated before being passed to the shell, an attacker can append arbitrary system commands to the intended pihole command. Furthermore, because the command is executed with sudo privileges, the injected commands will run with elevated (likely root) privileges. Version 6.0 patches the issue.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-33765 since 03/23/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/27/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

By approaching the search of inurl:savesettings.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 6.0 eliminates this vulnerability.

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

Productinfo

Vendor

• pi-hole

Name

• web

Version

• 5.x

Website

• Product: https://github.com/pi-hole/web/

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