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**Name of the Vulnerable Software and Affected Versions** Mozilla Firefox versions prior to 47.0 Firefox ESR versions 45.x prior to 45.2 **Description** The issue is related to inadequate access control in the browsers, which can be exploited by a remote attacker using a specially crafted web site. This can lead to a denial of service, causing the user interface to fail, or allow the attacker to conduct clickjacking or spoofing attacks. **Recommendations** For Mozilla Firefox versions prior to 47.0, update to version 47.0 or later to resolve the issue. For Firefox ESR versions 45.x prior to 45.2, update to version 45.2 or later to resolve the issue.