GitHub Advisoryadvisory · npm

GHSA-qxrj-hx23-xp82 Overly permissive origin policy

HIGH Published 2023-12-11 Modified 2023-12-12 Official page ↗
Aliases
CVE-2023-49803
Ecosystem
npm
Packages
@koa/cors
Severity
High
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Weaknesses
CWE-346
Reviewed
2023-12-11

Affected packages

• npm @koa/cors: < 5.0.0 → fixed in 5.0.0

Description

Currently, 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.

Related

Alias · CVE (1)

  • CVE-2023-49803 @koa/cors npm provides Cross-Origin Resource Sharing (CORS) for koa, a web framework for Node.js. vulnerability

Weakness · CWE (1)

  • CWE-346 Origin Validation Error weakness

References