Site Isolation Issue in Firefox by Mozilla

CVE-2026-74962

What is CVE-2026-74962?

A site isolation issue has been identified in the Networking: Cookies component of Firefox. This vulnerability allows for potential exposure of sensitive cookie information across sites, thereby posing risks to user privacy and data security. Mozilla has addressed this issue in Firefox version 154 and in its Extended Support Release (ESR) versions, 140.14 and 153.1. Users are encouraged to update their browsers to ensure protection from this vulnerability.

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