CVE-2026-27947: critical vulnerability in Intermesh groupoffice
Group-Office Vulnerable to Remote Code Execution (RCE)
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.4epss 0.8%
Group-Office is an enterprise customer relationship management and groupware tool. Versions prior to 26.0.9, 25.0.87, and 6.8.154 have an authenticated Remote Code Execution vulnerability in the TNEF attachment processing flow. The vulnerable path extracts attacker-controlled files from `winmail.dat` and then invokes `zip` with a shell wildcard (`*`). Because extracted filenames are attacker-controlled, they can be interpreted as `zip` options and lead to arbitrary command execution. Versions 26.0.9, 25.0.87, and 6.8.154 fix the issue.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA: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-2026-34838CRITICALGroup-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`EPSS 1.0%CVE-2026-25134CRITICALGroup-Office Argument Injection in MaintenanceController::actionZipLanguageEPSS 0.9%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%