CVE-2021-20088: Mootools Mootools-More

High severity, CVSS 8.8. EPSS: 1.4% chance of exploitation in the next 30 days.

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.

Affected products

• Mootools Mootools-More: version 1.6.0 only

Published 2021-04-23. Last modified 2026-06-17.