CVE-2023-4583

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 117 Firefox ESR versions prior to 115.2 Thunderbird versions prior to 115.2

Description The issue is related to the handling of private browsing sessions in Mozilla Firefox, Firefox ESR, and Thunderbird. When checking if the Browsing Context had been discarded in HttpBaseChannel, if the load group was not available, it was assumed to have already been discarded, which was not always the case for private channels after the private session had ended. This could allow a remote attacker to access confidential information.

Recommendations For Firefox versions prior to 117, update to version 117 or later. For Firefox ESR versions prior to 115.2, update to version 115.2 or later. For Thunderbird versions prior to 115.2, update to version 115.2 or later.