CVE-2026-12316

CRITICAL 9.1CVE-2026-12316 · Published 16/06/2026 · updated 26/10/2026

In short

CVE-2026-12316 is a CRITICAL (CVSS 9.1) vulnerability affecting firefox (mozilla), thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.24%, higher than 15.8% of all vulnerabilities.
Fix: update to 152.0.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 152.0.0`	`152.0.0`
thunderbird mozilla	`< 152.0.0`	`152.0.0`

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Package

Affected versions

Patched versions

< 152.0.0

152.0.0

< 152.0.0

152.0.0

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