{"id":"CVE-2021-20088","aliases":["GHSA-fw45-938v-p26j"],"url":"https://o3.security/vulnerability/CVE-2021-20088","summary":"mootools-more vulnerable to prototype pollution","details":"Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in mootools-more 1.6.0 allows a malicious user to inject properties into Object.prototype.","published":"2021-04-23T18:15:08.097Z","modified":"2026-07-08T20:30:21.070754Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"mootools-more","fixedVersion":null}],"fix":null,"references":[{"type":"EVIDENCE","url":"https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/mootools-more.md"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T20:30:21.070754Z"}}