CVE-2019-11730

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.

• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00055.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00058.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00073.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.htmlMailing List, Third Party Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1558299Issue Tracking, Permissions Required
• https://lists.debian.org/debian-lts-announce/2019/08/msg00001.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/08/msg00002.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/201908-12Third Party Advisory
• https://security.gentoo.org/glsa/201908-20Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-21/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-22/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-23/Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00055.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00058.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00073.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.htmlMailing List, Third Party Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1558299Issue Tracking, Permissions Required
• https://lists.debian.org/debian-lts-announce/2019/08/msg00001.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/08/msg00002.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/201908-12Third Party Advisory
• https://security.gentoo.org/glsa/201908-20Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-21/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-22/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-23/Vendor Advisory

Published

Jul 23, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2019-11724Application permissions give additional remote troubleshooti…6.1
• CVE-2019-11725When a user navigates to site marked as unsafe by the Safebr…6.5
• CVE-2019-11727A vulnerability exists where it possible to force Network Se…
• CVE-2019-11728The HTTP Alternative Services header, Alt-Svc, can be used b…4.7
• CVE-2019-11729Empty or malformed p256-ECDH public keys may trigger a segme…
• CVE-2019-1173An elevation of privilege vulnerability exists in the way th…7
• CVE-2019-11733When a master password is set, it is required to be entered …9.8
• CVE-2019-11734Mozilla developers and community members reported memory saf…9.8
• CVE-2019-11735Mozilla developers and community members reported memory saf…8.8
• CVE-2019-11736The Mozilla Maintenance Service does not guard against files…7
• CVE-2019-11737If a wildcard ('*') is specified for the host in Content Sec…5.3
• CVE-2019-11738If a Content Security Policy (CSP) directive is defined that…6.3