{"id":"GHSA-f9qj-4c5x-cpcw","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.","aliases":["CVE-2025-50864"],"modified":"2026-02-03T03:05:27.058127Z","published":"2025-08-20T15:31:42Z","database_specific":{"github_reviewed_at":"2025-08-20T20:50:39Z","nvd_published_at":"2025-08-20T15:15:32Z","cwe_ids":["CWE-178","CWE-346"],"severity":"MODERATE","github_reviewed":true},"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://github.com/elysiajs/elysia-cors/tree/main"},{"type":"WEB","url":"https://medium.com/@raghavagrawal_23036/cors-bypass-in-popular-opensource-library-ad27fb41e16a"},{"type":"WEB","url":"http://elysiajs.com"}],"affected":[{"package":{"name":"@elysiajs/cors","ecosystem":"npm","purl":"pkg:npm/%40elysiajs/cors"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"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"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"CVSS_V4","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"}]}