CVE-2026-12294Critical· 9.6▾ MidnightSandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 52.8 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 1.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.4%
Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
firefox < 115.37.0firefox < 152.0.0firefox >= 128.0, < 140.12.0thunderbird < 140.12.0thunderbird < 152.0.0Upgrade past the affected range:
firefox 140.12.0thunderbird 152.0.0Connected by shared product, vendor, weakness, or advisory.
CVE-2025-14323High· 8.8Privilege escalation in the DOM: Notifications component
CVE-2026-118008High· 8.8Privilege escalation in the DOM: Navigation component
CVE-2026-117999NoneRace condition in the IPC component
CVE-2026-117976NoneSite isolation issue in the DOM: Navigation component
CVE-2026-118027NoneFrame poisoning in the Layout component
CVE-2026-118024NoneUse-after-free in the Graphics: Text component