CVE-2025-50864 – Elysia-Cors Origin Validation Bypass Vulnerability

CVE ID : CVE-2025-50864

Published : Aug. 20, 2025, 3:15 p.m. | 1 hour ago

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.

Severity: 0.0 | NA

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