GitHub Advisoryadvisory · npm

GHSA-f9qj-4c5x-cpcw elysia-cors Origin Validation Error

MEDIUM Published 2025-08-20 Modified 2026-01-29 Official page ↗
Aliases
CVE-2025-50864
Ecosystem
npm
Packages
@elysiajs/cors
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Weaknesses
CWE-178, CWE-346
Reviewed
2025-08-20

Affected packages

• npm @elysiajs/cors: < 1.3.1 → fixed in 1.3.1

Description

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.

Related

Alias · CVE (1)

  • CVE-2025-50864 An Origin Validation Error in the elysia-cors library thru 1.3.0 allows attackers to bypass Cross-Origin Resource Sharing (CORS)… vulnerability

Weakness · CWE (2)

  • CWE-178 Improper Handling of Case Sensitivity weakness
  • CWE-346 Origin Validation Error weakness

References