MFSA2026-34: Security Vulnerabilities fixed in Thunderbird 140.10
Published Apr 21, 2026
·Updated
Security Vulnerabilities fixed in Thunderbird 140.10
Affected Software
1 affected componentFixes available
Mozilla Thunderbird<140.10
140.10
Event History
Apr 21, 2026
Advisory Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Child vulnerabilities
Contains the following vulnerabilities.
- CVE-2026-6746
- CVE-2026-6747
- CVE-2026-6748
- CVE-2026-6749
- CVE-2026-6750
- CVE-2026-6751
- CVE-2026-6752
- CVE-2026-6753
- CVE-2026-6754
- CVE-2026-6757
- CVE-2026-6759
- CVE-2026-6761
- CVE-2026-6762
- CVE-2026-6763
- CVE-2026-6764
- CVE-2026-6765
- CVE-2026-6766
- CVE-2026-6767
- CVE-2026-6769
- CVE-2026-6770
- CVE-2026-6771
- CVE-2026-6772
- CVE-2026-6776
- CVE-2026-6785
- CVE-2026-6786
Frequently Asked Questions
1
What is the severity of MFSA2026-34?
MFSA2026-34 addresses multiple security vulnerabilities with varying levels of severity that could potentially affect user privacy and data integrity.
2
How do I fix MFSA2026-34?
To fix MFSA2026-34, update your Mozilla Thunderbird to version 140.10 or later as it includes the necessary security patches.
3
What versions of Thunderbird are affected by MFSA2026-34?
MFSA2026-34 affects all versions of Mozilla Thunderbird prior to 140.10.
4
What types of vulnerabilities are covered in MFSA2026-34?
MFSA2026-34 covers security vulnerabilities that could lead to exploits involving user data exposure and system compromise.
5
Is it safe to continue using Thunderbird if I have not updated for MFSA2026-34?
Using an outdated version of Thunderbird that is affected by MFSA2026-34 poses significant security risks and is not recommended.