CVE-2019-9807

MEDIUM 4.3CVE-2019-9807 · Published 26/04/2019 · updated 17/06/2026

In short

CVE-2019-9807 is a MEDIUM (CVSS 4.3) vulnerability affecting firefox (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.79%, higher than 56.3% of all vulnerabilities.
Fix: update to 66.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 66.0`	`66.0`

Description

When arbitrary text is sent over an FTP connection and a page reload is initiated, it is possible to create a modal alert message with this text as the content. This could potentially be used for social engineering attacks. This vulnerability affects Firefox < 66.

References

bugzilla.mozilla.org/show_bug.cgi · Exploit
mozilla.org/security/advisories/mfsa2019-07 · Vendor Advisory

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Package

Affected versions

Patched versions

firefox

mozilla

< 66.0

66.0

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