Site Isolation Problem in Mozilla Firefox's Web Codecs Component

CVE-2026-74981

What is CVE-2026-74981?

A site isolation issue has been identified in the Web Codecs component of Mozilla Firefox, potentially allowing unintended access to sensitive user data. This vulnerability has been addressed in Firefox version 154 and Firefox ESR version 153.1, which include security improvements to protect users from potential exploitation. Users are advised to update their browsers to the latest versions to ensure their security.

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