🚨 CVE-2026-34838 (CRITICAL, CVSS 10): Group-Office <6.8.156, <25.0.90, <26.0.12 vulnerable to insecure deserialization (CWE-502). Authenticated attackers can achieve RCE by injecting malicious serialized objects. Patch now! https://radar.offseq.com/threat/cve-2026-34838-cwe-502-deserialization-of-untruste-f6c31d56 #OffSeq #Vuln #RCE