Mitigation Bypass in Firefox Browser's Bookmarks and History Component

CVE-2026-100828

What is CVE-2026-100828?

A technical flaw in Firefox's Bookmarks & History component allows attackers to bypass specific security mitigations. This vulnerability affects users of Firefox versions ESR 153.4 and 157. By exploiting this issue, malicious actors could potentially manipulate browser behavior in unforeseen ways. Users are encouraged to update their browsers to the latest versions to ensure their systems remain secure, as Mozilla has addressed this issue in subsequent updates.

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