CVE-2025-50864
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.
How to fix
- @elysiajs/cors1.3.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| @elysiajs/corsnpm | v < 1.3.1 | 1.3.1 |
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