CVE-2026-27947 Group-Office Vulnerable to Remote Code Execution (RCE)
Authenticated attackers can achieve remote code execution in Group-Office by exploiting command injection in TNEF attachment processing.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27947?
CVE-2026-27947 is a critical command injection vulnerability in Intermesh groupoffice, published on 27 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-27947?
It affects 1 product.
Products include Intermesh Group-Office.
How do I fix CVE-2026-27947?
No fix has been published for CVE-2026-27947 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-27947 being exploited?
There is no known exploitation of CVE-2026-27947 in the wild and no public exploit code.
Other vulnerabilities in Intermesh groupoffice
- CVE-2026-34838 Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`
- CVE-2026-33755 Authenticated SQL Injection in Contact/query addressBookIds filter
- CVE-2010-3428 SQL injection in n/a
- CVE-2026-27832 Group-Office Has Authenticated SQL Injection in advancedQueryData.comparator
- CVE-2025-48366 GroupOffice's Blind Stored XSS in Phone Number Field Enables Forced Redirect and Unauthorized Actions
Sources
Also known as GHSA-2rwh-9qp7-f92x.