{"cve":"CVE-2020-7616","nvd":{"published":"2020-04-07T14:15:14.387","modified":"2026-06-17T03:25:07.523","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-1321"],"references":["https://github.com/LingyuCoder/express-mock-middleware/blob/master/lib/index.js#L39","https://snyk.io/vuln/SNYK-JS-EXPRESSMOCKMIDDLEWARE-564120","https://github.com/LingyuCoder/express-mock-middleware/blob/master/lib/index.js#L39","https://snyk.io/vuln/SNYK-JS-EXPRESSMOCKMIDDLEWARE-564120"],"products":["express-mock-middleware_project:express-mock-middleware"],"source":"nvd","synced_at":"2026-10-19T21:03:08.679916934+00:00"},"epss":{"cve":"CVE-2020-7616","score":0.01274,"percentile":0.69909,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-v39h-qm32-8gwq","url":"https://osv.dev/vulnerability/GHSA-v39h-qm32-8gwq","summary":"Improperly Controlled Modification of Dynamically-Determined Object Attributes in express-mock-middleware","modified":"2026-03-13T22:11:18.287185Z","packages":[{"ecosystem":"npm","name":"express-mock-middleware","purl":"pkg:npm/express-mock-middleware","ranges":["<=0.0.6"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}