CVE-2025-50864
CVE-2025-50864
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.5 · Medium · EPSS 0.5% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
n/a
- Versions
- n/a: Affected
No fix published
@elysiajs/cors npm
- Affected ranges
- SEMVER: < 1.3.1
Update to 1.3.1
Original sources
- https://github.com/elysiajs/elysia-cors/blob/main/src/index.ts
- https://github.com/elysiajs/elysia-cors/tree/main
- https://medium.com/@raghavagrawal_23036/cors-bypass-in-popular-opensource-library-ad27fb41e16a
- https://github.com/elysiajs/elysia-cors/commit/9b9eb92e32a7a4b43b6d5108668941701c33e221
- https://nvd.nist.gov/vuln/detail/CVE-2025-50864