CVE-2020-7616: Express-Mock-Middleware Project Express-Mock-Middleware

Medium severity, CVSS 5.3. EPSS: 1.3% chance of exploitation in the next 30 days.

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.

Affected products

• Express-Mock-Middleware Project Express-Mock-Middleware: up to and including 0.0.6

Published 2020-04-07. Last modified 2026-06-17.