{"id":"CVE-2020-7616","aliases":[],"url":"https://o3.security/vulnerability/CVE-2020-7616","summary":"Improperly Controlled Modification of Dynamically-Determined Object Attributes in express-mock-middleware","details":"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.","published":"2021-12-09T19:57:29Z","modified":"2026-03-13T22:11:18.287185Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"express-mock-middleware","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-7616"},{"type":"WEB","url":"https://github.com/LingyuCoder/express-mock-middleware/blob/master/lib/index.js#L39"},{"type":"WEB","url":"https://snyk.io/vuln/SNYK-JS-EXPRESSMOCKMIDDLEWARE-564120"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-03-13T22:11:18.287185Z"}}