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Is Mozilla Firefox 153.4.0 patched?

Mozilla · cycle 153.4 · Official site ↗
153.4.011/100Critical

Current stable (157.0): 100/100

Minimum safe version155.0.0

153.4.0 has 16 open critical-or-high vulnerabilities. Run 155.0.0 or later to clear them. See what 155.0.0 fixes →

Health score11/100
Open issues20
Exploited now0
Cycle 153.4 EOL—
Latest release157.0

Summary iPlain-English security status for Mozilla Firefox 153.4.0, built from its CVEs, active-exploitation data, end-of-life date and latest release.

Mozilla Firefox 153.4.0 is part of the 153.4 release line. 20 known vulnerabilities affect it. The minimum safe version is 155.0.0 — upgrade to it or later to clear the open critical/high issues. The latest supported Mozilla Firefox release is 157.0.

Known issues affecting 153.4.0

Exploited first, then by exploitation probability.

CVE-2026-74940 CRITICAL EPSS 0% → fixed in 154.0.0 CVE-2026-75874 CRITICAL EPSS 0% → fixed in 154.0.0 CVE-2026-74979 CRITICAL EPSS 0% → fixed in 154.0.0 CVE-2026-74989 CRITICAL EPSS 0% → fixed in 154.0.0 CVE-2026-74965 HIGH EPSS 0% → fixed in 154.0.0 CVE-2026-84128 HIGH EPSS 0% → fixed in 155.0.0 CVE-2026-74947 HIGH EPSS 0% → fixed in 154.0.0 CVE-2026-74950 HIGH EPSS 0% → fixed in 154.0.0 CVE-2026-74955 HIGH EPSS 0% → fixed in 154.0.0 CVE-2026-74952 HIGH EPSS 0% → fixed in 154.0.0 CVE-2026-84126 MEDIUM EPSS 0% → fixed in 155.0.0 CVE-2026-84142 CRITICAL EPSS 0% → fixed in 155.0.0 CVE-2026-84138 MEDIUM EPSS 0% → fixed in 155.0.0 CVE-2026-74968 MEDIUM EPSS 0% → fixed in 154.0.0 CVE-2026-74937 HIGH EPSS — → fixed in 154.0.0 CVE-2026-74938 CRITICAL EPSS — → fixed in 154.0.0 CVE-2026-74954 HIGH EPSS — → fixed in 154.0.0 CVE-2026-74956 CRITICAL EPSS — → fixed in 154.0.0 CVE-2026-74958 HIGH EPSS — → fixed in 154.0.0 CVE-2026-74963 MEDIUM EPSS — → fixed in 154.0.0

Other Mozilla Firefox versions

Check another release line of Mozilla Firefox.

Mozilla Firefox 157.0Mozilla Firefox 156.0.1Mozilla Firefox 155.0.1Mozilla Firefox 154.0.1Mozilla Firefox 152.0.6Mozilla Firefox 151.0.4Mozilla Firefox 150.0.3Mozilla Firefox 149.0.2Mozilla Firefox 148.0.2Mozilla Firefox 147.0.4Mozilla Firefox 146.0.1Mozilla Firefox 145.0.2Mozilla Firefox 144.0.2Mozilla Firefox 143.0.4Mozilla Firefox 142.0.1Mozilla Firefox 141.0.3Mozilla Firefox 140.17.0Mozilla Firefox 139.0.4Mozilla Firefox 138.0.4Mozilla Firefox 137.0.2Mozilla Firefox 136.0.4Mozilla Firefox 135.0.1Mozilla Firefox 134.0.2Mozilla Firefox 133.0.3Mozilla Firefox 132.0.2Mozilla Firefox 131.0.3Mozilla Firefox 130.0.1Mozilla Firefox 129.0.2Mozilla Firefox 128.14.0Mozilla Firefox 127.0.2Mozilla Firefox 126.0.1Mozilla Firefox 125.0.3Mozilla Firefox 124.0.2Mozilla Firefox 123.0.1Mozilla Firefox 122.0.1Mozilla Firefox 121.0.1Mozilla Firefox 120.0.1Mozilla Firefox 119.0.1Mozilla Firefox 118.0.2Mozilla Firefox 117.0.1Mozilla Firefox 116.0.3Mozilla Firefox 115.38.0Mozilla Firefox 114.0.2Mozilla Firefox 113.0.2Mozilla Firefox 112.0.2Mozilla Firefox 111.0.1Mozilla Firefox 110.0.1Mozilla Firefox 109.0.1Mozilla Firefox 108.0.2Mozilla Firefox 107.0.1Mozilla Firefox 106.0.5Mozilla Firefox 105.0.3Mozilla Firefox 104.0.2Mozilla Firefox 103.0.2Mozilla Firefox 102.15.1Mozilla Firefox 91.13.0Mozilla Firefox 78.15.0

Frequently asked

Is Mozilla Firefox 153.4.0 patched?

Mozilla Firefox 153.4.0 has 16 open critical-or-high vulnerabilities. The minimum safe version is 155.0.0 — upgrade to 155.0.0 or later to clear them.

What version should I upgrade Mozilla Firefox 153.4.0 to?

Upgrade Mozilla Firefox 153.4.0 to at least 155.0.0 to clear its 16 open critical-or-high vulnerabilities.

What is the latest version of Mozilla Firefox?

The latest supported Mozilla Firefox release is 157.0.

Is Mozilla Firefox 153.4.0 still receiving security updates?

Yes — the 153.4 line is still supported and receiving security updates. The latest release is 157.0.

Informational only, from public data (NVD · CISA KEV · EPSS · endoflife.date), and can lag or miss vendor-specific fixes. Always confirm against Mozilla's official advisory before you patch or upgrade — Mozilla Firefox official site ↗