Windows apps · Mozilla

Mozilla Firefox (en-US) security updates

The latest version of Mozilla Firefox (en-US) is 159.0, released October 27, 2026. Patch Radar has 90 security fixes for Mozilla Firefox (en-US), closing 1,163 CVEs, 5 of which are being exploited. The newest security fix is Mozilla Firefox (en-US) 157.0.1, released October 6, 2026. Version 159.0 adds no new CVE fixes and includes all of them.

5 exploited CVEs
Latest version
159.0
Released Oct 27, 2026
Security fixes
90
On record in Patch Radar
CVEs
1,163
Closed by those fixes
Exploited
5
Vendor report or CISA KEV

Security fixes, newest first

PriorityFixFixed inCVEsExploitedReleased
Latest Mozilla Firefox (en-US) 159.0159.0 Includes every fix below Oct 27, 2026
Urgent Mozilla Firefox (en-US) 157.0.1157.0.1 1 Oct 6, 2026
Urgent Mozilla Firefox (en-US) 157.0157.0 75 Sep 29, 2026
Urgent Mozilla Firefox (en-US) 156.0156.0 72 Sep 15, 2026
Urgent Mozilla Firefox (en-US) 155.0155.0 26 Sep 1, 2026
Urgent Mozilla Firefox (en-US) 154.0154.0 56 Aug 18, 2026
Urgent Mozilla Firefox (en-US) 153.0153.0 61 Jul 21, 2026
High Mozilla Firefox (en-US) 152.0.6152.0.6 2 Jul 14, 2026
Urgent Mozilla Firefox (en-US) 152.0.4152.0.4 1 Jun 30, 2026
Urgent Mozilla Firefox (en-US) 152.0152.0 40 Jun 16, 2026
High Mozilla Firefox (en-US) 151.0.3151.0.3 2 Jun 2, 2026
Urgent Mozilla Firefox (en-US) 151.0151.0 31 May 19, 2026
High Mozilla Firefox (en-US) 150.0.3150.0.3 5 May 12, 2026
High Mozilla Firefox (en-US) 150.0.2150.0.2 3 May 7, 2026
High Mozilla Firefox (en-US) 150.0.1150.0.1 4 Apr 28, 2026
Urgent Mozilla Firefox (en-US) 150.0150.0 42 Apr 21, 2026
Urgent Mozilla Firefox (en-US) 149.0.2149.0.2 4 Apr 7, 2026
Urgent Mozilla Firefox (en-US) 149.0149.0 45 Mar 24, 2026
High Mozilla Firefox (en-US) 148.0.2148.0.2 2 Mar 10, 2026
Urgent Mozilla Firefox (en-US) 148.0148.0 51 Feb 24, 2026
High Mozilla Firefox (en-US) 147.0.4147.0.4 1 Feb 16, 2026
High Mozilla Firefox (en-US) 147.0.2147.0.2 2 Jan 27, 2026
Urgent Mozilla Firefox (en-US) 147.0147.0 16 Jan 13, 2026
Urgent Mozilla Firefox (en-US) 146.0.1146.0.1 2 Dec 18, 2025
Urgent Mozilla Firefox (en-US) 146.0146.0 13 Dec 9, 2025
Urgent Mozilla Firefox (en-US) 145.0145.0 16 Nov 11, 2025
Urgent Mozilla Firefox (en-US) 144.0.2144.0.2 1 Oct 28, 2025
Urgent Mozilla Firefox (en-US) 144.0144.0 10 Oct 14, 2025
High Mozilla Firefox (en-US) 143.0.3143.0.3 2 Sep 30, 2025
High Mozilla Firefox (en-US) 143.0.1143.0.1 1 Sep 19, 2025
High Mozilla Firefox (en-US) 143.0143.0 10 Sep 16, 2025
Urgent Mozilla Firefox (en-US) 142.0142.0 9 Aug 19, 2025
Urgent Mozilla Firefox (en-US) 141.0141.0 23 Jul 22, 2025
High Mozilla Firefox (en-US) 140.0140.0 10 Jun 24, 2025
Urgent Mozilla Firefox (en-US) 139.0.4139.0.4 2 Jun 10, 2025
High Mozilla Firefox (en-US) 139.0139.0 9 May 27, 2025
High Mozilla Firefox (en-US) 138.0.4138.0.4 2 May 17, 2025
High Mozilla Firefox (en-US) 138.0138.0 11 Apr 29, 2025
Routine Mozilla Firefox (en-US) 137.0.2137.0.2 1 Apr 15, 2025
High Mozilla Firefox (en-US) 137.0137.0 7 Apr 1, 2025
Urgent Mozilla Firefox (en-US) 136.0.4136.0.4 1 Mar 4, 2025
Urgent Mozilla Firefox (en-US) 136.0136.0 13 Mar 4, 2025
High Mozilla Firefox (en-US) 135.0135.0 13 Feb 6, 2025
Routine Mozilla Firefox (en-US) 135.0.1135.0.1 1 Feb 4, 2025
High Mozilla Firefox (en-US) 134.0134.0 9 Jan 7, 2025
Urgent Mozilla Firefox (en-US) 133.0133.0 16 Nov 27, 2024
Urgent Mozilla Firefox (en-US) 132.0132.0 12 Oct 30, 2024
Routine Mozilla Firefox (en-US) 131.0.3131.0.3 1 Oct 15, 2024
Patch now Mozilla Firefox (en-US) 131.0.2131.0.2 1 1 Oct 10, 2024
High Mozilla Firefox (en-US) 131.0131.0 13 Oct 2, 2024
High Mozilla Firefox (en-US) 130.0130.0 6 Sep 3, 2024
High Mozilla Firefox (en-US) 129.0129.0 18 Aug 6, 2024
High Mozilla Firefox (en-US) 129.0.1129.0.1 2 Aug 6, 2024
Urgent Mozilla Firefox (en-US) 128.0128.0 16 Jul 9, 2024
High Mozilla Firefox (en-US) 127.0127.0 15 Jun 11, 2024
High Mozilla Firefox (en-US) 126.0126.0 17 May 14, 2024
Urgent Mozilla Firefox (en-US) 125.0.1125.0.1 16 Apr 17, 2024
Urgent Mozilla Firefox (en-US) 124.0.2124.0.2 1 Apr 3, 2024
High Mozilla Firefox (en-US) 124.0.1124.0.1 1 Mar 23, 2024
High Mozilla Firefox (en-US) 124.0124.0 11 Mar 20, 2024
High Mozilla Firefox (en-US) 123.0123.0 12 Feb 26, 2024
High Mozilla Firefox (en-US) 122.0122.0 15 Jan 18, 2024
High Mozilla Firefox (en-US) 121.0121.0 15 Dec 20, 2023
High Mozilla Firefox (en-US) 120.0120.0 10 Nov 21, 2023
High Mozilla Firefox (en-US) 119.0119.0 10 Oct 24, 2023
Patch now Mozilla Firefox (en-US) 118.0.1118.0.1 1 1 Sep 29, 2023
Urgent Mozilla Firefox (en-US) 118.0118.0 9 Sep 26, 2023
Patch now Mozilla Firefox (en-US) 117.0.1117.0.1 1 1 Sep 12, 2023
High Mozilla Firefox (en-US) 117.0117.0 13 Aug 30, 2023
Urgent Mozilla Firefox (en-US) 116.0116.0 15 Aug 2, 2023
High Mozilla Firefox (en-US) 115.0.2115.0.2 1 Jul 12, 2023
High Mozilla Firefox (en-US) 115.0115.0 13 Jul 4, 2023
Urgent Mozilla Firefox (en-US) 114.0.1114.0.1 4 Jun 12, 2023
High Mozilla Firefox (en-US) 113.0113.0 12 May 10, 2023
Urgent Mozilla Firefox (en-US) 112.0112.0 18 Apr 12, 2023
High Mozilla Firefox (en-US) 111.0111.0 11 Mar 16, 2023
High Mozilla Firefox (en-US) 110.0110.0 19 Feb 16, 2023
High Mozilla Firefox (en-US) 109.0109.0 9 Jan 17, 2023
High Mozilla Firefox (en-US) 108.0108.0 6 Dec 14, 2022
High Mozilla Firefox (en-US) 107.0107.0 18 Nov 15, 2022
High Mozilla Firefox (en-US) 106.0106.0 9 Oct 19, 2022
High Mozilla Firefox (en-US) 105.0105.0 8 Sep 21, 2022
High Mozilla Firefox (en-US) 104.0104.0 6 Aug 24, 2022
High Mozilla Firefox (en-US) 103.0103.0 7 Jul 26, 2022
High Mozilla Firefox (en-US) 102.0102.0 17 Jun 27, 2022
High Mozilla Firefox (en-US) 101.0101.0 12 May 31, 2022
High Mozilla Firefox (en-US) 100.0.1100.0.1 8 May 19, 2022
High Mozilla Firefox (en-US) 99.099.0 10 Apr 5, 2022
Urgent Mozilla Firefox (en-US) 98.098.0 6 Mar 8, 2022
Patch now Mozilla Firefox (en-US) 97.0.297.0.2 2 2 Mar 5, 2022
High Mozilla Firefox (en-US) 97.097.0 12 Feb 8, 2022

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