Arbitrary file upload in Intermesh Group-Office
CVE-2026-27947
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (64.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.011 · change: +0.003
Affected products
- Intermesh Group-Office
- Intermesh Groupoffice — versions >= 26.0.0, < 26.0.9, >= 25.0.0, < 25.0.87, < 6.8.154
Weakness classification (CWE)
References
- github.com/Intermesh/groupoffice/security/advisories/GHSA-2rwh-9qp7-f92x (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-27947?
- CVE-2026-27947 is a high-severity vulnerability in Intermesh Group-Office, classified under Argument Injection. CVSS score: 8.8/10. Published 2026-02-27.
- How severe is CVE-2026-27947?
- High severity. CVSS v3 base score is 8.8 out of 10.