CVE-2026-27947: Intermesh Group-Office

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• Intermesh Group-Office: before 6.8.154 (fixed in 6.8.154); from 25.0.1, before 25.0.87 (fixed in 25.0.87); from 26.0.1, before 26.0.9 (fixed in 26.0.9)

Published 2026-02-27. Last modified 2026-06-17.