Windows apps · Mozilla

Mozilla Thunderbird (cs) security updates

The latest version of Mozilla Thunderbird (cs) is 159.0, released October 27, 2026. Patch Radar has 40 security fixes for Mozilla Thunderbird (cs), closing 721 CVEs, 1 of which is being exploited. The newest security fix is Mozilla Thunderbird (cs) 157.0, released September 30, 2026. Version 159.0 adds no new CVE fixes and includes all of them.

1 exploited CVEs
Latest version
159.0
Released Oct 27, 2026
Security fixes
40
On record in Patch Radar
CVEs
721
Closed by those fixes
Exploited
1
Vendor report or CISA KEV

Security fixes, newest first

PriorityFixFixed inCVEsExploitedReleased
Latest Mozilla Thunderbird (cs) 159.0159.0 Includes every fix below Oct 27, 2026
Urgent Mozilla Thunderbird (cs) 157.0157.0 76 Sep 30, 2026
Urgent Mozilla Thunderbird (cs) 156.0156.0 75 Sep 15, 2026
Urgent Mozilla Thunderbird (cs) 155.0155.0 31 Sep 1, 2026
Urgent Mozilla Thunderbird (cs) 154.0154.0 56 Aug 18, 2026
Urgent Mozilla Thunderbird (cs) 153.0153.0 53 Jul 21, 2026
Routine Mozilla Thunderbird (cs) 152.0.1152.0.1 2 Jul 1, 2026
Urgent Mozilla Thunderbird (cs) 152.0152.0 40 Jun 16, 2026
Urgent Mozilla Thunderbird (cs) 151.0151.0 25 May 19, 2026
High Mozilla Thunderbird (cs) 150.0.2150.0.2 3 May 8, 2026
High Mozilla Thunderbird (cs) 150.0.1150.0.1 4 Apr 30, 2026
Urgent Mozilla Thunderbird (cs) 150.0150.0 16 Apr 21, 2026
Urgent Mozilla Thunderbird (cs) 149.0.2149.0.2 3 Apr 7, 2026
Urgent Mozilla Thunderbird (cs) 149.0149.0 14 Mar 24, 2026
Urgent Mozilla Thunderbird (cs) 148.0148.0 50 Feb 24, 2026
High Mozilla Thunderbird (cs) 147.0.2147.0.2 1 Feb 16, 2026
Routine Mozilla Thunderbird (cs) 147.0.1147.0.1 1 Jan 28, 2026
Urgent Mozilla Thunderbird (cs) 147.0147.0 16 Jan 13, 2026
Urgent Mozilla Thunderbird (cs) 146.0146.0 13 Dec 10, 2025
Urgent Mozilla Thunderbird (cs) 144.0144.0 10 Oct 14, 2025
High Mozilla Thunderbird (cs) 143.0143.0 10 Sep 16, 2025
Urgent Mozilla Thunderbird (cs) 142.0142.0 7 Aug 19, 2025
Urgent Mozilla Thunderbird (cs) 141.0141.0 53 Jul 22, 2025
High Mozilla Thunderbird (cs) 140.0140.0 2 Jul 2, 2025
High Mozilla Thunderbird (cs) 139.0.2139.0.2 1 Jun 10, 2025
High Mozilla Thunderbird (cs) 139.0139.0 3 May 27, 2025
High Mozilla Thunderbird (cs) 138.0.2138.0.2 2 May 20, 2025
High Mozilla Thunderbird (cs) 138.0.1138.0.1 3 May 13, 2025
High Mozilla Thunderbird (cs) 138.0138.0 11 Apr 29, 2025
High Mozilla Thunderbird (cs) 137.0.2137.0.2 3 Apr 15, 2025
High Mozilla Thunderbird (cs) 137.0.1137.0.1 1 Apr 4, 2025
High Mozilla Thunderbird (cs) 137.0137.0 5 Apr 1, 2025
Patch now Mozilla Thunderbird (cs) 136.0136.0 87 1 Mar 4, 2025
High Mozilla Thunderbird (cs) 115.14.0115.14.0 7 Aug 6, 2024
High Mozilla Thunderbird (cs) 115.13.0115.13.0 5 Jul 16, 2024
High Mozilla Thunderbird (cs) 115.12.1115.12.1 8 Jun 19, 2024
High Mozilla Thunderbird (cs) 115.11.0115.11.0 6 May 15, 2024
Routine Mozilla Thunderbird (cs) 115.10.1115.10.1 1 Apr 18, 2024
Urgent Mozilla Thunderbird (cs) 115.10.0115.10.0 7 Apr 16, 2024
Urgent Mozilla Thunderbird (cs) 115.9.0115.9.0 9 Mar 19, 2024
High Mozilla Thunderbird (cs) 115.8.1115.8.1 1 Mar 5, 2024

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