A website could have obscured the fullscreen notification by using a URL with a scheme handled by an external program, such as a mailto URL. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 115, Firefox ESR < 102.13, and Thunderbird < 102.13.
Fix
Patch, vendor advisory and mitigation references on NVD 6
- https://www.mozilla.org/security/advisories/mfsa2023-22/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-23/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-24/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-22/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-23/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-24/ 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 6.5 · mozilla, debianNVD modified 2026-10-23 23:10
Affected (CPE criteria) 6
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
References 16
- https://bugzilla.mozilla.org/show_bug.cgi?id=1816287 Issue Tracking, Permissions Required
- https://lists.debian.org/debian-lts-announce/2023/07/msg00006.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/07/msg00015.html
- https://www.debian.org/security/2023/dsa-5450 Third Party Advisory
- https://www.debian.org/security/2023/dsa-5451 Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-22/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-23/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-24/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1816287 Issue Tracking, Permissions Required
- https://lists.debian.org/debian-lts-announce/2023/07/msg00006.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/07/msg00015.html
- https://www.debian.org/security/2023/dsa-5450 Third Party Advisory
- https://www.debian.org/security/2023/dsa-5451 Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-22/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-23/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-24/ Vendor Advisory