{"id":"CVE-2021-20088","aliases":["EUVD-2022-3844","GHSA-fw45-938v-p26j"],"status":"published","title":"mootools-more vulnerable to prototype pollution","description":"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.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01449,"percentile":0.737,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1321"],"published":"2021-04-23T17:49:25Z","modified":"2026-10-24T10:30:33Z","affected":[{"source":"ghsa","ecosystem":"npm","package":"mootools-more","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.6.0"}]}]},{"source":"osv","ecosystem":"npm","package":"mootools-more","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.6.0"}]}]}],"products":[{"vendor":"mootools","product":"mootools-more"}],"references":[{"url":"https://github.com/BlackFan/client-side-prototype-pollution/blob/master/pp/mootools-more.md","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20088","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-fw45-938v-p26j"},{"url":"https://github.com/mootools/mootools-more","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-20088","description":"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.","status":"published","published":"2021-04-23T17:49:25Z","modified":"2024-08-03T17:30:07.646Z","updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2022-3844","description":"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.","status":"published","published":"2021-04-23T17:49:25Z","modified":"2024-08-03T17:30:07Z","updated_at":"2026-11-03T03:25:09.355483Z"}],"ghsa":[{"id":"GHSA-fw45-938v-p26j","title":"mootools-more vulnerable to prototype pollution","description":"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.","status":"published","published":"2022-05-24T22:01:34Z","modified":"2024-04-22T23:15:05Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:37:44.335614Z"}],"nvd":[{"id":"CVE-2021-20088","description":"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.","status":"published","published":"2021-04-23T18:15:08.097Z","modified":"2026-06-17T03:33:15.293Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.5,"vector":"AV:N/AC:L/Au:S/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T14:06:52.03307Z"}],"osv":[{"id":"CVE-2021-20088","description":"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.","status":"published","published":"2021-04-23T18:15:08.097Z","modified":"2026-10-24T10:30:33.990449488Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:17.663289Z"},{"id":"GHSA-fw45-938v-p26j","title":"mootools-more vulnerable to prototype pollution","description":"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.","status":"published","published":"2022-05-24T22:01:34Z","modified":"2024-04-22T23:44:02.534197Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-1321"],"updated_at":"2026-11-02T15:46:47.119724Z"}]}}