Filipe Gomes

**Name of the Vulnerable Software and Affected Versions** Firefox versions prior to 51 Firefox ESR versions prior to 45.7 Thunderbird versions prior to 45.7 **Description** A use-after-free issue exists in the Media Decoder when handling media files, specifically when certain events are triggered after the media elements have been freed from memory. **Recommendations** For Firefox versions prior to 51, update to version 51 or later. For Firefox ESR versions prior to 45.7, update to version 45.7 or later. For Thunderbird versions prior to 45.7, update to version 45.7 or later.

**Name of the Vulnerable Software and Affected Versions** Firefox versions prior to 50.1 **Description** A use-after-free issue occurs when manipulating the "navigator" object within WebVR, which is not enabled by default. **Recommendations** For versions prior to 50.1, update to version 50.1 or later to resolve the issue.