GHSA-f9qj-4c5x-cpcw

Suggest an improvement
Source
https://github.com/advisories/GHSA-f9qj-4c5x-cpcw
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-f9qj-4c5x-cpcw/GHSA-f9qj-4c5x-cpcw.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-f9qj-4c5x-cpcw
Aliases
Published
2025-08-20T15:31:42Z
Modified
2026-02-03T03:05:27Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N CVSS Calculator
  • 6.9 (Medium) CVSS_V4 - 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 CVSS Calculator
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.

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"
}
References

Affected packages

npm / @elysiajs/cors

Package

Name
@elysiajs/cors
View open source insights on deps.dev
Purl
pkg:npm/%40elysiajs/cors

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.3.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-f9qj-4c5x-cpcw/GHSA-f9qj-4c5x-cpcw.json"