Vulnerability Description
@koa/cors npm provides Cross-Origin Resource Sharing (CORS) for koa, a web framework for Node.js. Prior to version 5.0.0, the middleware operates in a way that if an allowed origin is not provided, it will return an `Access-Control-Allow-Origin` header with the value of the origin from the request. This behavior completely disables one of the most crucial elements of browsers - the Same Origin Policy (SOP), this could cause a very serious security threat to the users of this middleware. If such behavior is expected, for instance, when middleware is used exclusively for prototypes and not for production applications, it should be heavily emphasized in the documentation along with an indication of the risks associated with such behavior, as many users may not be aware of it. Version 5.0.0 fixes this vulnerability.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Koajs | Cross-Origin Resource Sharing For Koa | < 5.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/koajs/cors/commit/f31dac99f5355c41e7d4dd3c4a80c5f154941a11Patch
- https://github.com/koajs/cors/security/advisories/GHSA-qxrj-hx23-xp82Vendor Advisory
- https://github.com/koajs/cors/commit/f31dac99f5355c41e7d4dd3c4a80c5f154941a11Patch
- https://github.com/koajs/cors/security/advisories/GHSA-qxrj-hx23-xp82Vendor Advisory
FAQ
What is CVE-2023-49803?
CVE-2023-49803 is a vulnerability with a CVSS score of 8.6 (HIGH). @koa/cors npm provides Cross-Origin Resource Sharing (CORS) for koa, a web framework for Node.js. Prior to version 5.0.0, the middleware operates in a way that if an allowed origin is not provided, it...
How severe is CVE-2023-49803?
CVE-2023-49803 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-49803?
Check the references section above for vendor advisories and patch information. Affected products include: Koajs Cross-Origin Resource Sharing For Koa.