A vulnerability exists where if a user opens a locally saved HTML file, this file can use file: URIs to access other files in the same directory or sub-directories if the names are known or guessed. The Fetch API can then be used to read the contents of any files stored in these directories and they may uploaded to a server. It was demonstrated that in combination with a popular Android messaging app, if a malicious HTML attachment is sent to a user and they opened that attachment in Firefox, due to that app's predictable pattern for locally-saved file names, it is possible to read attachments the victim received from other correspondents. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esr | Nov 8, 2019 | Jul 23, 2019 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | Apr 27, 2020 | Jul 23, 2019 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jul 23, 2019 |
| Centos_linux | — | Upgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade thunderbird | Jul 16, 2019 | Jul 9, 2019 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Jul 15, 2019 | Jul 15, 2019 |
| Freebsd | — | Upgrade firefoxUpgrade thunderbirdUpgrade linux-firefoxUpgrade linux-seamonkeyUpgrade seamonkeyUpgrade waterfoxUpgrade firefox-esrUpgrade libxulUpgrade linux-thunderbird | Jul 11, 2019 | Jul 9, 2019 |
| Gentoo Linux | — | Upgrade mail-client/thunderbird.Upgrade mail-client/thunderbird-bin.Upgrade www-client/firefox-bin.Upgrade www-client/firefox. | Aug 16, 2019 | Jul 23, 2019 |
| Oracle Solaris | — | Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 60.8.0-11.4.12.0.1.3.0 on Solaris 11.4Upgrade web/browser/firefox to version 60.8.0-11.4.12.0.1.3.0 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 60.8.0-11.4.12.0.1.3.0 on Solaris 11.4Upgrade mail/thunderbird to version 60.8.0-11.4.12.0.1.3.0 on Solaris 11.4 | Aug 21, 2019 | Jul 23, 2019 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefox | Jul 12, 2019 | Jul 10, 2019 |
| Redhat_linux | — | Upgrade thunderbirdUpgrade firefox-debuginfoUpgrade thunderbird-debugsourceUpgrade thunderbird-debuginfoNo solution existsUpgrade firefoxUpgrade firefox-debugsource | Jul 12, 2019 | Jul 11, 2019 |
| Suse | — | Upgrade mozilla-nspr-32bitUpgrade mozilla-nss-sysinit-32bitUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-develUpgrade firefox-gtk3-immodule-vietnameseUpgrade libfirefox-gthread-2_0-0Upgrade firefox-gtk3-langUpgrade MozillaThunderbirdUpgrade firefox-gtk3-immodules-tigrignaUpgrade firefox-gtk3-immodule-multipressUpgrade MozillaFirefox-translations-otherUpgrade mozilla-nssUpgrade mozillafirefox-branding-sleUpgrade firefox-gtk3-dataUpgrade mozilla-nspr-develUpgrade firefox-libgtk-3-0Upgrade MozillaThunderbird-buildsymbolsUpgrade MozillaThunderbird-translations-otherUpgrade libsoftokn3-32bitUpgrade firefox-gtk3-branding-upstreamUpgrade firefox-glib2-langUpgrade enigmailUpgrade mozilla-nsprUpgrade firefox-libharfbuzz0Upgrade mozilla-nss-sysinitUpgrade firefox-gdk-pixbuf-query-loadersUpgrade firefox-gtk3-immodule-thaiUpgrade libsoftokn3Upgrade firefox-libffi4Upgrade firefox-libffi7Upgrade firefox-gtk3-immodule-inuktitutUpgrade libfirefox-gobject-2_0-0Upgrade mozilla-nss-certs-32bitUpgrade libfreebl3-32bitUpgrade firefox-libcairo2Upgrade firefox-libgdk_pixbuf-2_0-0Upgrade firefox-libcairo-gobject2Upgrade MozillaThunderbird-translations-commonUpgrade firefox-gdk-pixbuf-langUpgrade firefox-gdk-pixbuf-thumbnailerUpgrade MozillaFirefox-branding-SLEDUpgrade firefox-gtk3-toolsUpgrade mozilla-nss-develUpgrade firefox-gtk3-immodule-ximUpgrade libfreebl3-hmacUpgrade mozilla-nss-toolsUpgrade mozillafirefox-branding-upstreamUpgrade libsoftokn3-hmac-32bitUpgrade libsoftokn3-hmacUpgrade mozilla-nss-32bitUpgrade MozillaFirefoxUpgrade mozillafirefox-buildsymbolsUpgrade libfreebl3-hmac-32bitUpgrade libfirefox-gio-2_0-0Upgrade firefox-atk-langUpgrade firefox-libatk-1_0-0Upgrade libfreebl3Upgrade firefox-glib2-toolsUpgrade firefox-gtk3-immodule-amharicUpgrade libfirefox-gmodule-2_0-0Upgrade mozilla-nss-certsUpgrade firefox-gio-branding-upstreamUpgrade firefox-libpango-1_0-0Upgrade libfirefox-glib-2_0-0 | Jul 18, 2019 | Jul 9, 2019 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Jul 13, 2019 | Jul 9, 2019 |
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