Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-34838

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.007
EPSS Ranking 71.8%
CVSS Severity
CVSS v3 Score 9.9
Products affected by CVE-2026-34838


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