Vulnerability · Published Feb 27, 2026 · Assigned by GitHub_M

CVE-2026-27947Group-Office Vulnerable to Remote Code Execution (RCE)

Critical 9.4

In plain English

A critical-severity argument injection in groupoffice from Intermesh. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).

Severity (CVSS 4.0)9.4Critical

Exploit odds (30 days)0.8%top 43.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Intermesh	groupoffice	>= 26.0.0, < 26.0.9>= 25.0.0, < 25.0.87< 6.8.154

Weakness: CWE-88, CWE-434 · Vector: 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

References

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