HIGH
If a malicious site repeatedly triggers a modal authentication prompt, eventually the browser UI will become non-responsive, requiring shutdown through the operating system. This is a denial of service (DOS) attack. This vulnerability affects Firefox < 52 and Thunderbird < 52.
http://www.securityfocus.com/bid/96692
http://www.securitytracker.com/id/1037966
https://bugzilla.mozilla.org/show_bug.cgi?id=1312243
Source: MITRE
Published: 2018-06-11
Updated: 2019-10-03
Type: NVD-CWE-noinfo
Base Score: 7.8
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C
Impact Score: 6.9
Exploitability Score: 10
Severity: HIGH
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH