security/vuxml: Add Mozilla vulnerabilities
- CVE-2026-5732: NVD assessment not yet provided
- CVE-2026-5733: NVD assessment not yet provided
- CVE-2026-5734: Base Score: 9.8 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVE-2026-5734: Base Score: 9.8 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H