CVE-2026-34838: critical vulnerability in Intermesh groupoffice
Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 10epss 1.0%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Intermesh · groupofficeRelated CVEs — Intermesh groupoffice
In the same product, most dangerous first.
CVE-2026-25512CRITICALGroup-Office is vulnerable to RCE due to Command Injection via TNEF Attachment HandlerEPSS 19.9%CVE-2026-25134CRITICALGroup-Office Argument Injection in MaintenanceController::actionZipLanguageEPSS 0.9%CVE-2026-27947CRITICALGroup-Office Vulnerable to Remote Code Execution (RCE)EPSS 0.8%CVE-2023-46730HIGHServer-Side Request Forgery in groupoffice EPSS 0.7%CVE-2026-25511HIGHGroup-Office is vulnerable to SSRF and File Read in WOPI service discoveryEPSS 0.4%CVE-2024-22418MEDIUMStored Cross-site Scripting Vulnerability via Malicious File Names in GroupOfficeEPSS 0.4%