CVE-2026-40925

WWBN AVideo is an open source video platform. In versions 29.0 and prior, objects/configurationUpdate.json.php (also routed via /updateConfig) persists dozens of global site settings from $_POST but protects the endpoint only with User::isAdmin(). It does not call forbidIfIsUntrustedRequest(), does not verify a globalToken, and does not validate the Origin/Referer header. Because AVideo intentionally sets session.cookie_samesite=None to support cross-origin iframe embedding, a logged-in administrator who visits an attacker-controlled page will have the browser auto-submit a cross-origin POST that rewrites the site's encoder URL, SMTP credentials, site <head> HTML, logo, favicon, contact email, and more in a single request. Commit f9492f5e6123dff0292d5bb3164fde7665dc36b4 contains a fix.

WWBN AVideo is an open source video platform. In versions 29.0 and prior, objects/configurationUpdate.json.php (also routed via /updateConfig) persists dozens of global site settings from $_POST but protects the endpoint only with User::isAdmin(). It does not call forbidIfIsUntrustedRequest(), does not verify a globalToken, and does not validate the Origin/Referer header. Because AVideo intentionally sets session.cookie_samesite=None to support cross-origin iframe embedding, a logged-in administrator who visits an attacker-controlled page will have the browser auto-submit a cross-origin POST that rewrites the site's encoder URL, SMTP credentials, site <head> HTML, logo, favicon, contact email, and more in a single request. Commit f9492f5e6123dff0292d5bb3164fde7665dc36b4 contains a fix.

Summary

objects/configurationUpdate.json.php (also routed via /updateConfig) persists dozens of global site settings from $_POST but protects the endpoint only with User::isAdmin(). It does not call forbidIfIsUntrustedRequest(), does not verify a globalToken, and does not validate the Origin/Referer header. Because AVideo intentionally sets session.cookie_samesite=None to support cross-origin iframe embedding, a logged-in administrator who visits an attacker-controlled page will have the browser auto-submit a cross-origin POST that rewrites the site's encoder URL, SMTP credentials, site <head> HTML, logo, favicon, contact email, and more in a single request.

Details

The entire authorization and CSRF check for the endpoint is this block at objects/configurationUpdate.json.php:10:

require_once $global['systemRootPath'] . 'objects/user.php';
if (!User::isAdmin()) {
    die('{"error":"' . __("Permission denied") . '"}');
}

Immediately after, $_POST values are written straight into the global AVideoConf object and persisted:

// objects/configurationUpdate.json.php
$config = new AVideoConf();
$config->setContactEmail($_POST['contactEmail']);          // :21
$config->setLanguage($_POST['language']);                  // :22
$config->setWebSiteTitle($_POST['webSiteTitle']);          // :23
$config->setDescription($_POST['description']);           // :24
$config->setAuthCanComment($_POST['authCanComment']);     // :25
$config->setAuthCanUploadVideos($_POST['authCanUploadVideos']); // :26
// Advanced (default enabled — $global['disableAdvancedConfigurations'] is empty by default):
$config->setEncoderURL($_POST['encoder_url']);            // :32
$config->setSmtp($_POST['smtp']);                         // :33
$config->setSmtpAuth($_POST['smtpAuth']);                 // :34
$config->setSmtpSecure($_POST['smtpSecure']);             // :35
$config->setSmtpHost($_POST['smtpHost']);                 // :36
$config->setSmtpUsername($_POST['smtpUsername']);         // :37
$config->setSmtpPassword($_POST['smtpPassword']);         // :38
$config->setSmtpPort($_POST['smtpPort']);                 // :39
$config->setHead($_POST['head']);                         // :42
// ...
// Logo / favicon writes:
$fileData = base64DataToImage($_POST['logoImgBase64']);   // :68
file_put_contents($global['systemRootPath'] . $photoURL, $fileData); // :71
// favicon base64 → file_put_contents → ImageMagick `convert` invocation (:88-120)
echo '{"status":"' . $config->save() . '", ...}';         // :130

Why CSRF actually lands

1. SameSite is intentionally None. objects/include_config.php:144 sets ini_set('session.cookie_samesite', 'None') and the adjacent comment states the design: "SameSite=None is intentional: AVideo supports cross-origin iframe embedding… All state-mutating endpoints that are vulnerable to CSRF must instead enforce a short-lived globalToken (verifyToken)." This endpoint enforces no such token.

2. Project already ships a CSRF primitive and uses it elsewhere. objects/functionsSecurity.php:138 defines forbidIfIsUntrustedRequest(), and the peer admin endpoint objects/userUpdate.json.php:18 calls it explicitly. configurationUpdate.json.php has no such call — grepping the file confirms no forbidIfIsUntrustedRequest, verifyToken, globalToken, or Origin/Referer check.

3. The request is CORS-simple. The admin UI submits with jQuery $.ajax(...type: 'post', data: {...}) (see view/configurations_body.php:753), which sends application/x-www-form-urlencoded. That content type is a CORS "simple" request — no preflight — so any third-party origin can trigger it from a <form> with the admin's session cookie attached.

4. Reachable via two paths. Direct POST /objects/configurationUpdate.json.php works, and .htaccess:459 also exposes it at POST /updateConfig.

Impact primitives unlocked by a single CSRF request

• setEncoderURL()…

WWBN AVideo is an open source video platform. In versions 29.0 and prior, objects/configurationUpdate.json.php (also routed via /updateConfig) persists dozens of global site settings from $_POST but protects the endpoint only with User::isAdmin(). It does not call forbidIfIsUntrustedRequest(), does not verify a globalToken, and does not validate the Origin/Referer header. Because AVideo intentionally sets session.cookie_samesite=None to support cross-origin iframe embedding, a logged-in administrator who visits an attacker-controlled page will have the browser auto-submit a cross-origin POST that rewrites the site's encoder URL, SMTP credentials, site <head> HTML, logo, favicon, contact email, and more in a single request. Commit f9492f5e6123dff0292d5bb3164fde7665dc36b4 contains a fix.

WWBN AVideo is an open source video platform. In versions 29.0 and prior, objects/configurationUpdate.json.php (also routed via /updateConfig) persists dozens of global site settings from $_POST but protects the endpoint only with User::isAdmin(). It does not call forbidIfIsUntrustedRequest(), does not verify a globalToken, and does not validate the Origin/Referer header. Because AVideo intentionally sets session.cookie_samesite=None to support cross-origin iframe embedding, a logged-in administrator who visits an attacker-controlled page will have the browser auto-submit a cross-origin POST that rewrites the site's encoder URL, SMTP credentials, site <head> HTML, logo, favicon, contact email, and more in a single request. Commit f9492f5e6123dff0292d5bb3164fde7665dc36b4 contains a fix.

Summary

objects/configurationUpdate.json.php (also routed via /updateConfig) persists dozens of global site settings from $_POST but protects the endpoint only with User::isAdmin(). It does not call forbidIfIsUntrustedRequest(), does not verify a globalToken, and does not validate the Origin/Referer header. Because AVideo intentionally sets session.cookie_samesite=None to support cross-origin iframe embedding, a logged-in administrator who visits an attacker-controlled page will have the browser auto-submit a cross-origin POST that rewrites the site's encoder URL, SMTP credentials, site <head> HTML, logo, favicon, contact email, and more in a single request.

Details

The entire authorization and CSRF check for the endpoint is this block at objects/configurationUpdate.json.php:10:

require_once $global['systemRootPath'] . 'objects/user.php';
if (!User::isAdmin()) {
    die('{"error":"' . __("Permission denied") . '"}');
}

Immediately after, $_POST values are written straight into the global AVideoConf object and persisted:

// objects/configurationUpdate.json.php
$config = new AVideoConf();
$config->setContactEmail($_POST['contactEmail']);          // :21
$config->setLanguage($_POST['language']);                  // :22
$config->setWebSiteTitle($_POST['webSiteTitle']);          // :23
$config->setDescription($_POST['description']);           // :24
$config->setAuthCanComment($_POST['authCanComment']);     // :25
$config->setAuthCanUploadVideos($_POST['authCanUploadVideos']); // :26
// Advanced (default enabled — $global['disableAdvancedConfigurations'] is empty by default):
$config->setEncoderURL($_POST['encoder_url']);            // :32
$config->setSmtp($_POST['smtp']);                         // :33
$config->setSmtpAuth($_POST['smtpAuth']);                 // :34
$config->setSmtpSecure($_POST['smtpSecure']);             // :35
$config->setSmtpHost($_POST['smtpHost']);                 // :36
$config->setSmtpUsername($_POST['smtpUsername']);         // :37
$config->setSmtpPassword($_POST['smtpPassword']);         // :38
$config->setSmtpPort($_POST['smtpPort']);                 // :39
$config->setHead($_POST['head']);                         // :42
// ...
// Logo / favicon writes:
$fileData = base64DataToImage($_POST['logoImgBase64']);   // :68
file_put_contents($global['systemRootPath'] . $photoURL, $fileData); // :71
// favicon base64 → file_put_contents → ImageMagick `convert` invocation (:88-120)
echo '{"status":"' . $config->save() . '", ...}';         // :130

Why CSRF actually lands

1. SameSite is intentionally None. objects/include_config.php:144 sets ini_set('session.cookie_samesite', 'None') and the adjacent comment states the design: "SameSite=None is intentional: AVideo supports cross-origin iframe embedding… All state-mutating endpoints that are vulnerable to CSRF must instead enforce a short-lived globalToken (verifyToken)." This endpoint enforces no such token.

2. Project already ships a CSRF primitive and uses it elsewhere. objects/functionsSecurity.php:138 defines forbidIfIsUntrustedRequest(), and the peer admin endpoint objects/userUpdate.json.php:18 calls it explicitly. configurationUpdate.json.php has no such call — grepping the file confirms no forbidIfIsUntrustedRequest, verifyToken, globalToken, or Origin/Referer check.

3. The request is CORS-simple. The admin UI submits with jQuery $.ajax(...type: 'post', data: {...}) (see view/configurations_body.php:753), which sends application/x-www-form-urlencoded. That content type is a CORS "simple" request — no preflight — so any third-party origin can trigger it from a <form> with the admin's session cookie attached.

4. Reachable via two paths. Direct POST /objects/configurationUpdate.json.php works, and .htaccess:459 also exposes it at POST /updateConfig.

Impact primitives unlocked by a single CSRF request

• setEncoderURL()…