GHSA-XVG8-M4X3-W6XR

Vulnerability from github – Published: 2024-11-12 19:54 – Updated: 2025-11-04 16:53
VLAI
Summary
matrix-js-sdk has insufficient MXC URI validation which allows client-side path traversal
Details

Summary

matrix-js-sdk before 34.11.0 is vulnerable to client-side path traversal via crafted MXC URIs. A malicious room member can trigger clients based on the matrix-js-sdk to issue arbitrary authenticated GET requests to the client's homeserver.

Details

The Matrix specification demands homeservers to perform validation of the server-name and media-id components of MXC URIs with the intent to prevent path traversal. However, it is not mentioned that a similar check must also be performed on the client to prevent client-side path traversal. matrix-js-sdk fails to perform this validation.

Patches

Fixed in matrix-js-sdk 34.11.1.

Workarounds

None.

References

  • https://spec.matrix.org/v1.12/client-server-api/#security-considerations-5
  • https://blog.doyensec.com/2024/07/02/cspt2csrf.html
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "matrix-js-sdk"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "34.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-50336"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-11-12T19:54:38Z",
    "nvd_published_at": "2024-11-12T17:15:09Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nmatrix-js-sdk before 34.11.0 is vulnerable to client-side path traversal via crafted MXC URIs. A malicious room member can trigger clients based on the matrix-js-sdk to issue arbitrary authenticated GET requests to the client\u0027s homeserver.\n\n### Details\n\nThe Matrix specification demands homeservers to [perform validation](https://spec.matrix.org/v1.12/client-server-api/#security-considerations-5) of the `server-name` and `media-id` components of MXC URIs with the intent to prevent path traversal. However, it is not mentioned that a similar check must also be performed on the client to prevent *client-side* path traversal. matrix-js-sdk fails to perform this validation.\n\n### Patches\n\nFixed in matrix-js-sdk 34.11.1.\n\n### Workarounds\n\nNone.\n\n### References\n\n- https://spec.matrix.org/v1.12/client-server-api/#security-considerations-5\n- https://blog.doyensec.com/2024/07/02/cspt2csrf.html",
  "id": "GHSA-xvg8-m4x3-w6xr",
  "modified": "2025-11-04T16:53:54Z",
  "published": "2024-11-12T19:54:38Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-xvg8-m4x3-w6xr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50336"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/matrix-org/matrix-js-sdk"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html"
    },
    {
      "type": "WEB",
      "url": "https://spec.matrix.org/v1.12/client-server-api/#security-considerations-5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "matrix-js-sdk has insufficient MXC URI validation which allows client-side path traversal"
}



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