Vulnerability · Published Feb 4, 2026 · Assigned by GitHub_M
CVE-2026-25512Group-Office is vulnerable to RCE due to Command Injection via TNEF Attachment Handler
Critical 9.4
In plain English
A critical-severity OS command injection in groupoffice from Intermesh. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 19.9% (higher than 97% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code.
Official description
Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.150, 25.0.82, and 26.0.5, there is a remote code execution (RCE) vulnerability in Group-Office. The endpoint email/message/tnefAttachmentFromTempFile directly concatenates the user-controlled parameter tmp_file into an exec() call. By injecting shell metacharacters into tmp_file, an authenticated attacker can execute arbitrary system commands on the server. This issue has been patched in versions 6.8.150, 25.0.82, and 26.0.5.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Intermesh | groupoffice | < 6.8.150< 25.0.82< 26.0.5 |
Weakness: CWE-78 · 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