MFSA2026-01: Security Vulnerabilities fixed in Firefox 147
Published Jan 13, 2026
·Updated
Security Vulnerabilities fixed in Firefox 147
Affected Software
1 affected componentFixes available
Mozilla Firefox<147
147
Event History
Jan 13, 2026
Advisory Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Child vulnerabilities
Contains the following vulnerabilities.
Frequently Asked Questions
1
What vulnerabilities are addressed in MFSA2026-01?
MFSA2026-01 addresses multiple security vulnerabilities in Firefox 147.
2
What is the severity of MFSA2026-01?
The severity of MFSA2026-01 varies depending on the specific vulnerability it addresses.
3
How do I fix MFSA2026-01?
To fix MFSA2026-01, update Firefox to version 147 or above immediately.
4
Which versions of Firefox are affected by MFSA2026-01?
MFSA2026-01 affects versions of Firefox up to and including version 147.
5
Who is responsible for the vulnerabilities fixed in MFSA2026-01?
Mozilla is responsible for addressing the vulnerabilities fixed in MFSA2026-01.