GHSA-F9QJ-4C5X-CPCW

Vulnerability from github – Published: 2025-08-20 15:31 – Updated: 2025-08-21 15:41
VLAI?
Summary
elysia-cors Origin Validation Error
Details

An Origin Validation Error in the elysia-cors library thru 1.3.0 allows attackers to bypass Cross-Origin Resource Sharing (CORS) restrictions. The library incorrectly validates the supplied origin by checking if it is a substring of any domain in the site's CORS policy, rather than performing an exact match. For example, a malicious origin like "notexample.com", "example.common.net" is whitelisted when the site's CORS policy specifies "example.com." This vulnerability enables unauthorized access to user data on sites using the elysia-cors library for CORS validation.

Severity ?
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@elysiajs/cors"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-50864"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-178",
      "CWE-346"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-20T20:50:39Z",
    "nvd_published_at": "2025-08-20T15:15:32Z",
    "severity": "MODERATE"
  },
  "details": "An Origin Validation Error in the elysia-cors library thru 1.3.0 allows attackers to bypass Cross-Origin Resource Sharing (CORS) restrictions. The library incorrectly validates the supplied origin by checking if it is a substring of any domain in the site\u0027s CORS policy, rather than performing an exact match. For example, a malicious origin like \"notexample.com\", \"example.common.net\" is whitelisted when the site\u0027s CORS policy specifies \"example.com.\" This vulnerability enables unauthorized access to user data on sites using the elysia-cors library for CORS validation.",
  "id": "GHSA-f9qj-4c5x-cpcw",
  "modified": "2025-08-21T15:41:42Z",
  "published": "2025-08-20T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-50864"
    },
    {
      "type": "WEB",
      "url": "https://github.com/elysiajs/elysia-cors/commit/9b9eb92e32a7a4b43b6d5108668941701c33e221"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/elysiajs/elysia-cors"
    },
    {
      "type": "WEB",
      "url": "https://github.com/elysiajs/elysia-cors/blob/main/src/index.ts"
    },
    {
      "type": "WEB",
      "url": "https://medium.com/@raghavagrawal_23036/cors-bypass-in-popular-opensource-library-ad27fb41e16a"
    },
    {
      "type": "WEB",
      "url": "http://elysiajs.com"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "elysia-cors Origin Validation Error"
}


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