When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted, and the content of that error may have revealed information about the resource. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
[
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"status": "affected",
"version": "< 86"
}
]
},
{
"product": "Thunderbird",
"vendor": "Mozilla",
"versions": [
{
"status": "affected",
"version": "< 78.8"
}
]
},
{
"product": "Firefox ESR",
"vendor": "Mozilla",
"versions": [
{
"status": "affected",
"version": "< 78.8"
}
]
}
]
bugzilla.mozilla.org/show_bug.cgi?id=1690976
lists.debian.org/debian-lts-announce/2021/03/msg00000.html
security.gentoo.org/glsa/202104-09
security.gentoo.org/glsa/202104-10
www.debian.org/security/2021/dsa-4866
www.mozilla.org/security/advisories/mfsa2021-07/
www.mozilla.org/security/advisories/mfsa2021-08/
www.mozilla.org/security/advisories/mfsa2021-09/