CVE-2020-15654

Name	CVE-2020-15654
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
firefox (PTS)	sid	147.0-1	fixed
thunderbird (PTS)	bullseye	1:115.12.0-1~deb11u1	fixed
	bullseye (security)	1:140.6.0esr-1~deb11u1	fixed
	bookworm, bookworm (security)	1:140.6.0esr-1~deb12u1	fixed
	trixie (security), trixie	1:140.6.0esr-1~deb13u1	fixed
	forky, sid	1:140.6.0esr-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
firefox	source	(unstable)	79.0-1
thunderbird	source	(unstable)	(not affected)

Notes

- thunderbird <not-affected> (Only affects Thunderbird 78.x)
https://www.mozilla.org/en-US/security/advisories/mfsa2020-32/#CVE-2020-15654
https://www.mozilla.org/en-US/security/advisories/mfsa2020-33/#CVE-2020-15654