What’s Vulnerable › Vulnerabilities

CVE-2024-11698

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-26 · updated 2026-06-17

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.

Affected products

• Mozilla Firefox: before 128.5.0; before 133.0 — fixed in 128.5.0, 133.0
• Mozilla Thunderbird: before 128.5.0; from 129.0 before 133.0 — fixed in 128.5.0, 133.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 128.5.0, 133.0; Mozilla Thunderbird 128.5.0, 133.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1916152
• https://www.mozilla.org/security/advisories/mfsa2024-63/
• https://www.mozilla.org/security/advisories/mfsa2024-64/
• https://www.mozilla.org/security/advisories/mfsa2024-67/
• https://www.mozilla.org/security/advisories/mfsa2024-68/

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