CVSS
5.6
CVSS v3.1
EPSS
N/A
Exploit Prediction Score
Published
August 13, 2026
Exploitability
No EPSS data available
Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.22.0, the public extend() utility in ui/src/utils/extend/extend.js recursively copied attacker-controlled object keys during extend(true, target, source) deep merges without rejecting an own __proto__ property. The merge could descend into the prototype object and write attacker-controlled properties to Object.prototype in the same JavaScript process. Applications that passed user-controlled or partially user-controlled objects to extend() could experience logic bypass, unsafe default-option injection, denial of service, or other application-specific impact when polluted properties were later consumed. This issue is fixed in version 2.22.0.
No package data available.
Publisher and database URLs for this record (shown for attribution; reading stays in Bugflare).