MFSA2026-05: Security Vulnerabilities fixed in Thunderbird 140.7
Published Jan 13, 2026
·Updated
Security Vulnerabilities fixed in Thunderbird 140.7
Affected Software
1 affected componentFixes available
Mozilla Thunderbird<140.7
140.7
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 is the severity of MFSA2026-05?
The severity of MFSA2026-05 is classified as high due to multiple security vulnerabilities in Thunderbird 140.7.
2
How do I fix MFSA2026-05?
To fix MFSA2026-05, you should update Thunderbird to version 140.8 or higher.
3
What vulnerabilities does MFSA2026-05 address?
MFSA2026-05 addresses multiple security vulnerabilities that could allow for information leaks and execute arbitrary code.
4
Who is affected by MFSA2026-05?
Users of Mozilla Thunderbird versions up to 140.7 are affected by MFSA2026-05.
5
Is there a workaround for MFSA2026-05 until I can update?
There are no known workarounds for MFSA2026-05, so updating to a patched version is recommended.