MFSA2025-77: Security Vulnerabilities fixed in Thunderbird 143
Published Sep 16, 2025
·Updated
Security Vulnerabilities fixed in Thunderbird 143
Affected Software
1 affected componentFixes available
Mozilla Thunderbird<143
143
Event History
Sep 16, 2025
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 MFSA2025-77?
The severity of MFSA2025-77 is classified as high due to the impact on user data integrity.
2
How do I fix MFSA2025-77?
To fix MFSA2025-77, update Thunderbird to version 143 immediately.
3
What vulnerabilities are addressed in MFSA2025-77?
MFSA2025-77 addresses multiple security vulnerabilities including potential data leaks and integrity issues.
4
Which version of Thunderbird is affected by MFSA2025-77?
Thunderbird versions prior to 143 are affected by MFSA2025-77.
5
Can I still use Thunderbird without fixing MFSA2025-77?
Using an affected version of Thunderbird without fixing MFSA2025-77 poses security risks and is not recommended.