Description
A flaw in handling fullscreen transitions may have inadvertently caused the application to become stuck in fullscreen mode when a modal dialog was opened during the transition. This issue left users unable to exit fullscreen mode using standard actions like pressing "Esc" or accessing right-click menus, resulting in a disrupted browsing experience until the browser is restarted. *This bug only affects the application when running on macOS. Other operating systems are unaffected.* This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Mozilla / Firefoxunspecified – 133
- Mozilla / Firefox ESRunspecified – 128.5
- Mozilla / Thunderbirdunspecified – 133
- Mozilla / Thunderbirdunspecified – 128.5
References
- MISChttps://bugzilla.mozilla.org/show_bug.cgi?id=1916152
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2024-63/
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2024-64/
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2024-67/
- VENDOR_ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2024-68/