Firefox 78
Support for Firefox 78 ended on 02/11/2021. There are no more security updates for this branch.
Latest version: 78.15.0, released on 05/10/2021
End of support: 02/11/2021
1406 known vulnerabilities open in 78.15.0
Vulnerabilities in Firefox 78
1407 vulnerabilities from the NVD affect at least one version of this branch. Last checked on 03/11/2026.
- CVE-2024-9680, CVSS 3.1: 9.8, actively exploited: still open in 78.15.0
- CVE-2022-26486, CVSS 3.1: 9.6, actively exploited: still open in 78.15.0
- CVE-2023-5217, CVSS 3.1: 8.8, actively exploited: still open in 78.15.0
- CVE-2023-4863, CVSS 3.1: 8.8, actively exploited: still open in 78.15.0
- CVE-2022-26485, CVSS 3.1: 8.8, actively exploited: still open in 78.15.0
- CVE-2026-75874, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-4725, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-4692, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-4689, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-4688, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-2778, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-2776, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-2768, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-2761, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-2760, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-16367, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-0881, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2025-2857, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2021-4140, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2021-38503, CVSS 3.1: 10.0: still open in 78.15.0
- CVE-2026-92066, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-92061, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-92037, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-92036, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-8956, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-84143, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-84142, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-84141, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-84140, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-84134, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-84133, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-84129, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-8401, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-8094, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-8091, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74990, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74989, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74988, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74987, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74985, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74979, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74964, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74944, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74943, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74940, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-74936, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-6771, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-6768, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-6760, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-6748, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-5735, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-5734, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4729, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4723, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4721, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4720, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4717, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4711, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4710, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4705, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4702, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4701, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4700, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4698, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4696, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-4691, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2807, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2805, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2800, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2799, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2797, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2796, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2795, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2793, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2792, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2791, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2790, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2789, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2788, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2787, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2786, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2785, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2784, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2782, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2781, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2780, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2779, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2777, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2775, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2774, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2773, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2772, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2771, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2770, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2767, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2766, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2765, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2764, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2763, CVSS 3.1: 9.8: still open in 78.15.0
- CVE-2026-2762, CVSS 3.1: 9.8: still open in 78.15.0
And 1307 more.
66 vulnerabilities of Firefox have no version information in the NVD and are not assigned to any branch.
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