CVE-2025-50864
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | n/a |
| Product | n/a |
| Published | Aug 20, 2025 |
| Last Updated | Jul 5, 2026 |
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Affected Versions
n/a / n/a
n/a
References
github.com: https://github.com/elysiajs/elysia-cors/blob/main/src/index.ts github.com: https://github.com/elysiajs/elysia-cors/tree/main medium.com: https://medium.com/@raghavagrawal_23036/cors-bypass-in-popular-opensource-library-ad27fb41e16a github.com: https://github.com/elysiajs/elysia-cors/commit/9b9eb92e32a7a4b43b6d5108668941701c33e221