GHSA-MWJC-5J4X-R686

Vulnerability from github – Published: 2026-03-20 21:55 – Updated: 2026-03-25 14:32
VLAI
Summary
AVideo has an unauthenticated decrypt oracle leaking any ciphertext
Details

Summary

The API plugin exposes a decryptString action without any authentication. Anyone can submit ciphertext and receive plaintext. Ciphertext is issued publicly (e.g., view/url2Embed.json.php), so any user can recover protected tokens/metadata. Severity: High.

Details

  • Entry: plugin/API/get.json.php is unauthenticated.
  • Handler: plugin/API/API.php get_api_decryptString() (lines ~5945–5966): php $string = decryptString($_REQUEST['string']); return new ApiObject($string, empty($string)); No APISecret or user check occurs before decrypting.
  • Public ciphertext source: view/url2Embed.json.php returns playLink/playEmbedLink (encryptString(json_encode(...))) to any caller.

PoC

  1. Obtain ciphertext: GET /view/url2Embed.json.php?url=https://example.com/video.mp4 Copy playLink.
  2. Decrypt without auth: ``` POST /plugin/API/get.json.php?APIName=decryptString Content-Type: application/x-www-form-urlencoded

string= ``` Response contains the plaintext JSON (videoLink, title, users_id, etc.).

Impact

  • Any encrypted payload produced by the platform can be decrypted by anyone.
  • Leaks tokens/links intended to be confidential; enables replay and tampering where secrecy was assumed.

Mitigation

  • Require API secret or authenticated/authorized user for decryptString, or remove the endpoint.
  • Prefer one-way signatures (HMAC) instead of exposing generic decryption.
  • Rotate encryption keys/salts after patch to invalidate exposed ciphertexts.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "wwbn/avideo"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "26.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33512"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287",
      "CWE-312",
      "CWE-326",
      "CWE-327"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-20T21:55:12Z",
    "nvd_published_at": "2026-03-23T19:16:40Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nThe API plugin exposes a `decryptString` action without any authentication. Anyone can submit ciphertext and receive plaintext. Ciphertext is issued publicly (e.g., `view/url2Embed.json.php`), so any user can recover protected tokens/metadata. Severity: High.\n\n### Details\n- Entry: `plugin/API/get.json.php` is unauthenticated.\n- Handler: `plugin/API/API.php` `get_api_decryptString()` (lines ~5945\u20135966):\n  ```php\n  $string = decryptString($_REQUEST[\u0027string\u0027]);\n  return new ApiObject($string, empty($string));\n  ```\n  No APISecret or user check occurs before decrypting.\n- Public ciphertext source: `view/url2Embed.json.php` returns `playLink`/`playEmbedLink` (`encryptString(json_encode(...))`) to any caller.\n\n### PoC\n1. Obtain ciphertext:\n   ```\n   GET /view/url2Embed.json.php?url=https://example.com/video.mp4\n   ```\n   Copy `playLink`.\n2. Decrypt without auth:\n   ```\n   POST /plugin/API/get.json.php?APIName=decryptString\n   Content-Type: application/x-www-form-urlencoded\n\n   string=\u003cplayLink ciphertext\u003e\n   ```\n   Response contains the plaintext JSON (videoLink, title, users_id, etc.).\n\n### Impact\n- Any encrypted payload produced by the platform can be decrypted by anyone.\n- Leaks tokens/links intended to be confidential; enables replay and tampering where secrecy was assumed.\n\n### Mitigation\n- Require API secret or authenticated/authorized user for `decryptString`, or remove the endpoint.\n- Prefer one-way signatures (HMAC) instead of exposing generic decryption.\n- Rotate encryption keys/salts after patch to invalidate exposed ciphertexts.",
  "id": "GHSA-mwjc-5j4x-r686",
  "modified": "2026-03-25T14:32:36Z",
  "published": "2026-03-20T21:55:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-mwjc-5j4x-r686"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33512"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WWBN/AVideo/commit/3fdeecef37bb88967a02ccc9b9acc8da95de1c13"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/WWBN/AVideo"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "AVideo has an unauthenticated decrypt oracle leaking any ciphertext"
}



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