EUVD-2026-16781CVSS 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/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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Description
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.
Analysis
Remote code execution with root privileges in Pi-hole Admin Interface versions prior to 6.0 allows unauthenticated attackers to execute arbitrary system commands. The vulnerability stems from unsanitized user input in the 'webtheme' parameter being concatenated directly into sudo-privileged exec() calls in savesettings.php. …
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Remediation
Within 24 hours: Immediately isolate all Pi-hole Admin Interface instances from untrusted networks using firewall rules or network segmentation; document current deployment topology and network exposure. Within 7 days: Upgrade to Pi-hole version 6.0 or later if available; if upgrade path does not exist, implement mandatory network-based access controls restricting Admin Interface to trusted administrative networks only. …
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