Glazou

**Name of the Vulnerable Software and Affected Versions** Mozilla Firefox versions 4.x through 10.0 Firefox ESR versions 10.x before 10.0.3 Thunderbird versions 5.0 through 10.0 Thunderbird ESR versions 10.x before 10.0.3 SeaMonkey version before 2.8 **Description** The Cascading Style Sheets (CSS) implementation allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via dynamic modification of a keyframe followed by access to the `cssText` of the keyframe. **Recommendations** For Mozilla Firefox versions 4.x through 10.0, update to a version after 10.0. For Firefox ESR versions 10.x before 10.0.3, update to version 10.0.3 or later. For Thunderbird versions 5.0 through 10.0, update to a version after 10.0. For Thunderbird ESR versions 10.x before 10.0.3, update to version 10.0.3 or later. For SeaMonkey version before 2.8, update to version 2.8 or later.