Watch — Undercover High School

SECURITY PoC — NO AUTH

CDN bypass demo: stream served without an auth header

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CDN bypass demonstration The API returned playingUrl for Undercover High School with issubscriber: false and user_access: deny. The video above plays from Munowatch's own CDN with zero authentication.

Security research evidence Inspect entitlement results, CDN URLs, and the raw API response Access control failed

API response evidence

Endpoint called GET /api/preview/v2/57125/0

User ID used 0 (no user / not logged in)

JWT used Expired Feb 2024 (extracted from APK)

issubscriber false

user_access deny

paid_for YES (premium content)

substatus EXPIRED

serverhost 69

video_name 1-Undercover High School-VJ IVO.mp4

playingUrl returned YES — URL in response

API playingUrl value https://munowatch.co/clips/ELI.mp4

CDN demo stream https://nkuba.b-cdn.net/cleve48/cfr/In.The.Grey.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": 57125,
    "video_title": "Undercover High School",
    "description": "Ace NIS agent Jung Hae-seong is demoted after a mission failure. He goes undercover at a high school to locate King Gojong's missing gold, meeting his teacher Oh Soo-ah, who sees him as her lost first love, stirring old heartbreak.",
    "video_name": "1-Undercover High School-VJ IVO.mp4",
    "filehistory": "",
    "openload": "0",
    "embedurl": "",
    "serverhost": "69",
    "allow_openload": "0",
    "full_video_name": "",
    "duration": "34h 02m",
    "thumbnail": "https://apposters.b-cdn.net/laba/yo/naki/TnL67rw3sG4677.jpg",
    "tfilehistory": "",
    "category_id": 5,
    "language_id": 1,
    "recording_date": "2025-05-30",
    "age_id": "18 +",
    "location": 1,
    "tab_category_id": 5,
    "series_code": "77325",
    "access": "1",
    "paid_for": "1",
    "new_movie": "1",
    "priority": "No",
    "size": "214.53 MB",
    "create_date": "2025-05-30 13:05:13",
    "schedule_date": "30.05.2025 04:33:12 PM",
    "user_id": 1118356,
    "vj_id": 27,
    "video_status_id": 0,
    "network_id": "45.221.10.185",
    "user_access": "deny",
    "notification": "No",
    "secduration": "122520.000000",
    "issubscriber": false,
    "genre": "Series",
    "vjname": "Vj Ivo",
    "trailer_playing_url": "",
    "episodes": 24,
    "episode_state": "NEXT",
    "nxt_eps": "EPS   2",
    "nxt_eps_id": 57126,
    "nxt_eps_title": "Undercover High School 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": "1 year ago",
    "mstatus": false,
    "kstatus": "",
    "substatus": "EXPIRED"
}