What’s Vulnerable › Vulnerabilities
CVE-2026-27947: Group-Office Vulnerable to Remote Code Execution (RCE)
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-27 · updated 2026-06-17
- Weakness: CWE-88
Description
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; from 25.0.1 before 25.0.87; from 26.0.1 before 26.0.9 — fixed in 25.0.87, 26.0.9, 6.8.154
How to fix
Upgrade to a fixed version: Intermesh Group-Office 25.0.87, 26.0.9, 6.8.154. Check the vendor advisory for mitigations.
References
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