Mozilla Firefox and Thunderbird Race Condition Vulnerability Leading to Privacy Leak

A race condition vulnerability has been identified in Mozilla Firefox and Thunderbird, which could have allowed private browsing tabs to be opened in normal browsing windows, potentially leading to a privacy leak. This issue affects Firefox versions prior to 135, Firefox ESR versions prior to 128.7, and Thunderbird versions prior to 128.7 and 135.

Impact

Exploitation of this vulnerability could have caused private browsing tabs to be inadvertently opened in regular browsing windows, creating a risk of unauthorized privacy exposure.

Remediation

Users can upgrade to Firefox 135, Firefox ESR 128.7, Thunderbird 135, or Thunderbird 128.7 to address this vulnerability.