A background script invoking <code>requestFullscreen</code> and then blocking the main thread could force the browser into fullscreen mode indefinitely, resulting in potential user confusion or spoofing attacks. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.
Fix
Patch, vendor advisory and mitigation references on NVD 9
- https://bugzilla.mozilla.org/show_bug.cgi?id=1794622 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-05/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-06/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-07/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1794622 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-05/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-06/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-07/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1794622 Issue Tracking, Permissions Required, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.4 · mozillaNVD modified 2026-10-24 13:10
Affected (CPE criteria) 3
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
References 9
- https://bugzilla.mozilla.org/show_bug.cgi?id=1794622 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-05/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-06/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-07/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1794622 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-05/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-06/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-07/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1794622 Issue Tracking, Permissions Required, Vendor Advisory