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.
mei23
commented
9 months ago
This PR contains the following updates:
4.0.0->5.0.0GitHub Vulnerability Alerts
CVE-2023-49803
Currently, the middleware operates in a way that if an allowed origin is not provided, it will return an
Access-Control-Allow-Originheader 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.
Release Notes
koajs/cors (@koa/cors)
### [`v5.0.0`](https://togithub.com/koajs/cors/blob/HEAD/History.md#500--2023-12-11) [Compare Source](https://togithub.com/koajs/cors/compare/4.0.0...5.0.0) \================== **others** - \[[`f31dac9`](http://github.com/koajs/cors/commit/f31dac99f5355c41e7d4dd3c4a80c5f154941a11)] - Merge pull request from GHSA-qxrj-hx23-xp82 (fengmk2 <Configuration
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