CVE-2025-50864 | BDVDB-2026-290502 Detail

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.

Impact#

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Exploit#

History#

1. Version 12025-08-20Record published in the CVE List.
2. Version 22026-07-05Most recent update recorded in the CVE List.