CVE-2019-9794

A vulnerability was discovered where specific command line arguments are not properly discarded during Firefox invocation as a shell handler for URLs. This could be used to retrieve and execute files whose location is supplied through these command line arguments if Firefox is configured as the default URI handler for a given URI scheme in third party applications and these applications insufficiently sanitize URL data. *Note: This issue only affects Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

• CWE-88

• https://bugzilla.mozilla.org/show_bug.cgi?id=1530103Issue Tracking, Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-08/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-11/Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1530103Issue Tracking, Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-08/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2019-11/Vendor Advisory

Published

Apr 26, 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.
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