CVE-2026-34838
CriticalCVSS 9.9Exploitation Probability (EPSS)
Elevated risk60th percentile - higher than 60% of all known CVEs
Summary
Group-Office prior to versions 6.8.156, 25.0.90, and 26.0.12 has a vulnerability in the AbstractSettingsCollection model leading to insecure deserialization, allowing arbitrary file write and remote code execution.
Risk Assessment
An authenticated attacker can gain full control of the Group-Office server.
Recommendation
Upgrade Group-Office to one of the patched versions: 6.8.156, 25.0.90, or 26.0.12.
Original NVD description (English source)
Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.156, 25.0.90, and 26.0.12, a vulnerability in the AbstractSettingsCollection model leads to insecure deserialization when these settings are loaded. By injecting a serialized FileCookieJar object into a setting string, an authenticated attacker can achieve Arbitrary File Write, leading directly to Remote Code Execution (RCE) on the server. This issue has been patched in versions 6.8.156, 25.0.90, and 26.0.12.