WebExtensions can bypass user prompts to first save and then open an arbitrarily downloaded file. This can result in an executable file running with local user privileges without explicit user consent. This vulnerability affects Firefox < 58.
https://usn.ubuntu.com/3544-1/
http://www.securitytracker.com/id/1040270
http://www.securityfocus.com/bid/102786
https://www.mozilla.org/security/advisories/mfsa2018-02/
https://bugzilla.mozilla.org/show_bug.cgi?id=1390882
Source: Mitre, NVD
Published: 2018-06-11
Updated: 2024-11-21
Base Score: 7.2
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
Severity: High
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS: 0.00095