CVE-2026-16405

A vulnerability in the WebSockets component of Firefox and Thunderbird allows for information disclosure, potentially exposing sensitive data to unauthorized parties. Users of affected versions should prioritize updating to Firefox 153, Firefox ESR 140.13, Thunderbird 153, or Thunderbird 140.13 to mitigate this high-severity risk. Organizations relying on these applications for secure communications should take immediate action to protect their data integrity.