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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://elysiajs.com
https://github.com/elysiajs/elysia-cors/blob/main/src/index.ts
https://github.com/elysiajs/elysia-cors/tree/main
https://medium.com/@raghavagrawal_23036/cors-bypass-in-popular-opensource-library-ad27fb41e16a

Frequently Asked Questions

What is the severity of CVE-2025-50864?
CVE-2025-50864 has been scored as a medium severity vulnerability.
How to fix CVE-2025-50864?
To fix CVE-2025-50864, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-50864 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-50864 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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