CVE-2026-27947

critical · 9.4

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.

9.4

CVSS

0.7%

EPSS (exploit prob.)

53rd

EPSS percentile

2026-02-27

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-88CWE-434

Affected products

Vendor	Product	Affected versions
intermesh	group-office	< 6.8.154
intermesh	group-office	>= 25.0.1, < 25.0.87
intermesh	group-office	>= 26.0.1, < 26.0.9

Check a specific version with /api/v1/cve/match.

References

https://github.com/Intermesh/groupoffice/security/advisories/GHSA-2rwh-9qp7-f92x

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-27947