Description
When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
References (6)
Core 6
Core References
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2020-30/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2020-32/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2020-33/
Issue Tracking, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1648333
Third Party Advisory vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.html
Third Party Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/4443-1/
Scores
CVSS v3
6.5
EPSS
0.0049
EPSS Percentile
65.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Details
VulnCheck KEV
2020-08-06
CWE
CWE-835
Status
published
Products (6)
canonical/ubuntu_linux
16.04
canonical/ubuntu_linux
18.04
canonical/ubuntu_linux
20.04
mozilla/firefox
< 79.0
mozilla/firefox_esr
< 78.1
mozilla/thunderbird
< 78.1
Published
Aug 10, 2020
Tracked Since
Feb 18, 2026