Live › vulnerability › CVE-2026-117997
Go to dashboardA use-after-free bug in the Firefox Widget component allows escape from the browser sandbox. The sources do not say what an attacker gets after escaping or how the bug is triggered.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-27 14:32 UTC. All times on this page are UTC.
Teams with Firefox or Firefox ESR installed on machines they manage, where a version older than 159 (or ESR older than 153.6) is running. The sources do not say which configurations or content are needed to trigger it. Servers that do not run a desktop browser can likely skip it, but the sources do not confirm this.
No product ranges from the sources yet.
firefox --version or check Help > About Firefox and compare against the fixed versions153.6 or laterEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
Sandbox escape due to use-after-free in the Widget component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.
This page as .md · .json · in your agent: get_signal("CVE-2026-117997")
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