added cvss_v4 field and value

Author: jasnow

gems/avo/CVE-2026-33209.yml

@@ -24,6 +24,7 @@ description: |
   - In unauthenticated setups: exploitable via crafted links sent to users.
   - In authenticated setups: limited to authenticated users and
     requires interaction.
+cvss_v4: 5.3
 patched_versions:
   - ">= 3.30.3"
 related: