express-mock-middleware through 0.0.6 is vulnerable to Prototype Pollution. Exported functions by the package can be tricked into adding or modifying properties of the `Object.prototype`. Exploitation of this vulnerability requires creation of a new directory where an attack code can be placed which will then be exported by `express-mock-middleware`. As such, this is considered to be a low risk.
The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.
| Link | Tags |
|---|---|
| https://snyk.io/vuln/SNYK-JS-EXPRESSMOCKMIDDLEWARE-564120 | third party advisory exploit |
| https://github.com/LingyuCoder/express-mock-middleware/blob/master/lib/index.js#L39 | third party advisory |