Windows apps · Mozilla
Mozilla Firefox (fa) security updates
The latest version of Mozilla Firefox (fa) is 159.0, released October 27, 2026. Patch Radar has 37 security fixes for Mozilla Firefox (fa), closing 663 CVEs. The newest security fix is Mozilla Firefox (fa) 157.0.1, released October 6, 2026. Version 159.0 adds no new CVE fixes and includes all of them.
Latest version
159.0
Released Oct 27, 2026
Security fixes
37
On record in Patch Radar
CVEs
663
Closed by those fixes
Exploited
0
Vendor report or CISA KEV
Security fixes, newest first
| Priority | Fix | Fixed in | CVEs | Exploited | Released |
|---|---|---|---|---|---|
| Latest | Mozilla Firefox (fa) 159.0 | 159.0 | Includes every fix below | Oct 27, 2026 | |
| Urgent | Mozilla Firefox (fa) 157.0.1 | 157.0.1 | 1 | Oct 6, 2026 | |
| Urgent | Mozilla Firefox (fa) 157.0 | 157.0 | 75 | Sep 29, 2026 | |
| Urgent | Mozilla Firefox (fa) 156.0 | 156.0 | 72 | Sep 15, 2026 | |
| Urgent | Mozilla Firefox (fa) 155.0 | 155.0 | 26 | Sep 1, 2026 | |
| Urgent | Mozilla Firefox (fa) 154.0 | 154.0 | 56 | Aug 18, 2026 | |
| Urgent | Mozilla Firefox (fa) 153.0 | 153.0 | 61 | Jul 21, 2026 | |
| High | Mozilla Firefox (fa) 152.0.6 | 152.0.6 | 2 | Jul 14, 2026 | |
| Urgent | Mozilla Firefox (fa) 152.0.4 | 152.0.4 | 1 | Jun 30, 2026 | |
| Urgent | Mozilla Firefox (fa) 152.0 | 152.0 | 40 | Jun 16, 2026 | |
| High | Mozilla Firefox (fa) 151.0.3 | 151.0.3 | 2 | Jun 2, 2026 | |
| Urgent | Mozilla Firefox (fa) 151.0 | 151.0 | 31 | May 19, 2026 | |
| High | Mozilla Firefox (fa) 150.0.3 | 150.0.3 | 5 | May 12, 2026 | |
| High | Mozilla Firefox (fa) 150.0.2 | 150.0.2 | 3 | May 7, 2026 | |
| High | Mozilla Firefox (fa) 150.0.1 | 150.0.1 | 4 | Apr 28, 2026 | |
| Urgent | Mozilla Firefox (fa) 150.0 | 150.0 | 42 | Apr 21, 2026 | |
| Urgent | Mozilla Firefox (fa) 149.0.2 | 149.0.2 | 4 | Apr 7, 2026 | |
| Urgent | Mozilla Firefox (fa) 149.0 | 149.0 | 45 | Mar 24, 2026 | |
| High | Mozilla Firefox (fa) 148.0.2 | 148.0.2 | 2 | Mar 10, 2026 | |
| Urgent | Mozilla Firefox (fa) 148.0 | 148.0 | 51 | Feb 24, 2026 | |
| High | Mozilla Firefox (fa) 147.0.4 | 147.0.4 | 1 | Feb 16, 2026 | |
| High | Mozilla Firefox (fa) 147.0.2 | 147.0.2 | 2 | Jan 27, 2026 | |
| Urgent | Mozilla Firefox (fa) 147.0 | 147.0 | 16 | Jan 13, 2026 | |
| Urgent | Mozilla Firefox (fa) 146.0.1 | 146.0.1 | 2 | Dec 18, 2025 | |
| Urgent | Mozilla Firefox (fa) 146.0 | 146.0 | 13 | Dec 9, 2025 | |
| Urgent | Mozilla Firefox (fa) 145.0 | 145.0 | 16 | Nov 11, 2025 | |
| Urgent | Mozilla Firefox (fa) 144.0.2 | 144.0.2 | 1 | Oct 28, 2025 | |
| Urgent | Mozilla Firefox (fa) 144.0 | 144.0 | 10 | Oct 14, 2025 | |
| High | Mozilla Firefox (fa) 143.0.3 | 143.0.3 | 2 | Sep 30, 2025 | |
| High | Mozilla Firefox (fa) 143.0.1 | 143.0.1 | 1 | Sep 19, 2025 | |
| High | Mozilla Firefox (fa) 143.0 | 143.0 | 10 | Sep 16, 2025 | |
| Urgent | Mozilla Firefox (fa) 142.0 | 142.0 | 9 | Aug 19, 2025 | |
| Urgent | Mozilla Firefox (fa) 141.0 | 141.0 | 23 | Jul 22, 2025 | |
| High | Mozilla Firefox (fa) 140.0 | 140.0 | 10 | Jun 24, 2025 | |
| Urgent | Mozilla Firefox (fa) 139.0.4 | 139.0.4 | 2 | Jun 10, 2025 | |
| High | Mozilla Firefox (fa) 139.0 | 139.0 | 9 | May 27, 2025 | |
| High | Mozilla Firefox (fa) 138.0.4 | 138.0.4 | 2 | May 17, 2025 | |
| High | Mozilla Firefox (fa) 138.0 | 138.0 | 11 | Apr 29, 2025 | |
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