vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2019-9801

N/A
Published: April 26, 2019 at 04:13 PM UTC
Updated: June 17, 2026 at 02:44 AM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR· also runs on 1 platform

Using Thunderbird by Mozilla?

Get instant alerts when new vulnerabilities affect Thunderbird - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
N/A
Exploit prediction
EPSS 1%

Description

Firefox will accept any registered Program ID as an external protocol handler and offer to launch this local application when given a matching URL on Windows operating systems. This should only happen if the program has specifically registered itself as a "URL Handler" in the Windows registry. *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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 66
Affected range stops below 66, so it looks safe — our inference, not a vendor statement
Affected range stops below 66.0, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)
Firefox ESR· Mozilla
95%
v < 60.6
Affected range stops below 60.6, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)
Thunderbird· Mozilla
95%
v < 60.6
Affected range stops below 60.6, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

References (4)

x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1527717
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2019-07/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2019-08/
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2019-11/

CVSS

5MEDIUM[email protected]
Confidentiality
NONE
Integrity
PARTIAL
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card