Vulnerability in N/a
CVE-2025-50864
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.
EPSS: 0.005 (39.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
Affected products
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2025-50864?
- CVE-2025-50864 is a medium-severity vulnerability in N/a, classified under Improper Handling of Case Sensitivity. CVSS score: 6.5/10. Published 2025-08-20.
- How severe is CVE-2025-50864?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2025-50864 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.