CVE-2019-9794

Critical

Description

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.

SeverityCritical
CVSS9.8
Exploit probability—
ProductMozilla Firefox
PublishedApr 26, 2019
First seenApr 26, 2019

How to fix

Update
  • mozilla firefox60.6.0, 66.0 or later
  • mozilla thunderbird60.6.0 or later

Affected products

ProductAffected versionsFixed in
mozilla firefoxv < 60.6.0, v < 66.060.6.0, 66.0
mozilla thunderbirdv < 60.6.060.6.0

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