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HIGH

CVE-2026-27947

CVSS v3

8.8

HIGH

EPSS Score

1.0 %

exploit probability, as of 2026-09-26

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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

Technical details

Published
2026-02-27
Last Modified
2026-03-04

Frequently asked questions

What is 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

Is CVE-2026-27947 actively exploited?

Active exploitation of CVE-2026-27947 has not been confirmed. Its EPSS score was 1.0% on 2026-09-26, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-27947?

CVE-2026-27947 has a CVSS v3 base score of 8.8 (HIGH severity).

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