CVE-2026-12296Critical· 9.6▾ MidnightSandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, 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 Jul 30.
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 Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
firefox < 140.12.0firefox < 152.0.0thunderbird < 140.12.0thunderbird < 152.0.0Upgrade past the affected range:
firefox 152.0.0thunderbird 152.0.0Connected by shared product, vendor, weakness, or advisory.
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