VULNERABILITY INTELLIGENCE
CVE-2025-50864
CVSS score6.5 MEDIUM
EPSS probability0.49%
CISA KEVNot currently listed
Published2025-08-20
Last modified2026-07-05
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
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.
Weakness classification
- 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-178