CVE-2026-16399highCWE-346

CVE-2026-16399: high-severity vulnerability in Mozilla Firefox

Site isolation issue in the DOM: Navigation component

Published · Updated

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 0.2%
Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Mozilla · FirefoxMozilla · Thunderbird
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