Firefox ESR 140.15 security bulletin: 11 CVEs incl. sandbox escape, UAF, priv-esc

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Security Advisory Mozilla Foundation Security Advisory 2026-84 High Mozilla

Affected:

Firefox ESR < 140.15
Firefox 154
Firefox ESR 153.1
Firefox ESR 140.14
Firefox ESR 115.30

Fixed in:

Firefox ESR 140.15
Firefox 155
Firefox ESR 153.2
Firefox ESR 115.40

Referenced CVEs: CVE-2026-84143 CVE-2026-84124 CVE-2026-84122 CVE-2026-84145 CVE-2026-84131 CVE-2026-84121 CVE-2026-84120 CVE-2026-84119 CVE-2026-75874 CVE-2026-16371

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Firefox ESR 140.15 security bulletin: 11 CVEs incl. sandbox escape, UAF, priv-esc