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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 thunderbird-debuginfoUpgrade thunderbird | 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-debuginfoUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debugsourceUpgrade thunderbird | Jul 16, 2019 | Jul 9, 2019 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Jul 15, 2019 | Jul 15, 2019 |
| Freebsd | — | Upgrade linux-thunderbirdUpgrade libxulUpgrade linux-seamonkeyUpgrade seamonkeyUpgrade linux-firefoxUpgrade firefox-esrUpgrade firefoxUpgrade waterfoxUpgrade thunderbird | Jul 11, 2019 | Jul 9, 2019 |
| Gentoo Linux | — | Upgrade www-client/firefox.Upgrade mail-client/thunderbird-bin.Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird. | 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 mail/thunderbird 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 11.4 | Aug 21, 2019 | Jul 23, 2019 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Jul 12, 2019 | Jul 10, 2019 |
| Redhat_linux | — | Upgrade firefox-debugsourceUpgrade firefoxNo solution existsUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade thunderbirdUpgrade thunderbird-debuginfo | Jul 12, 2019 | Jul 11, 2019 |
| Suse | — | Upgrade firefox-libharfbuzz0Upgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbirdUpgrade libfirefox-gthread-2_0-0Upgrade MozillaThunderbird-translations-otherUpgrade firefox-gdk-pixbuf-query-loadersUpgrade mozillafirefox-branding-sleUpgrade mozilla-nspr-32bitUpgrade firefox-gtk3-branding-upstreamUpgrade firefox-glib2-langUpgrade firefox-gtk3-dataUpgrade mozilla-nspr-develUpgrade libsoftokn3-32bitUpgrade mozilla-nss-sysinitUpgrade enigmailUpgrade libsoftokn3Upgrade mozilla-nss-sysinit-32bitUpgrade firefox-gtk3-immodules-tigrignaUpgrade firefox-gtk3-langUpgrade mozilla-nsprUpgrade firefox-gtk3-immodule-inuktitutUpgrade firefox-libffi7Upgrade firefox-libgtk-3-0Upgrade firefox-libffi4Upgrade MozillaThunderbird-buildsymbolsUpgrade firefox-gtk3-immodule-vietnameseUpgrade firefox-gtk3-immodule-thaiUpgrade MozillaFirefox-develUpgrade firefox-gtk3-immodule-multipressUpgrade MozillaFirefox-translations-otherUpgrade mozilla-nssUpgrade firefox-gtk3-toolsUpgrade firefox-gdk-pixbuf-thumbnailerUpgrade firefox-gtk3-immodule-amharicUpgrade firefox-gio-branding-upstreamUpgrade mozilla-nss-certs-32bitUpgrade libfirefox-glib-2_0-0Upgrade mozillafirefox-branding-upstreamUpgrade firefox-libpango-1_0-0Upgrade libfirefox-gio-2_0-0Upgrade firefox-atk-langUpgrade mozilla-nss-toolsUpgrade libsoftokn3-hmacUpgrade libfreebl3-hmacUpgrade firefox-libcairo-gobject2Upgrade mozilla-nss-develUpgrade firefox-gtk3-immodule-ximUpgrade firefox-libatk-1_0-0Upgrade firefox-libgdk_pixbuf-2_0-0Upgrade firefox-libcairo2Upgrade firefox-gdk-pixbuf-langUpgrade firefox-glib2-toolsUpgrade mozilla-nss-32bitUpgrade mozillafirefox-buildsymbolsUpgrade libsoftokn3-hmac-32bitUpgrade MozillaFirefox-branding-SLEDUpgrade libfreebl3-hmac-32bitUpgrade MozillaFirefoxUpgrade libfreebl3Upgrade MozillaThunderbird-translations-commonUpgrade libfirefox-gobject-2_0-0Upgrade libfreebl3-32bitUpgrade libfirefox-gmodule-2_0-0Upgrade mozilla-nss-certs | Jul 18, 2019 | Jul 9, 2019 |
| Ubuntu | — | Upgrade thunderbirdUpgrade firefox | Jul 13, 2019 | Jul 9, 2019 |
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