What’s Vulnerable › Vulnerabilities

CVE-2026-25512: Group-Office is vulnerable to RCE due to Command Injection via TNEF Attachment Handler

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 20.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-04 · updated 2026-06-17
• Weakness: CWE-78

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

• Intermesh groupoffice: before 6.8.150; from 25.0.1 before 25.0.82; from 26.0.1 before 26.0.5 — fixed in 25.0.82, 26.0.5, 6.8.150

How to fix

Upgrade to a fixed version: Intermesh groupoffice 25.0.82, 26.0.5, 6.8.150. Check the vendor advisory for mitigations.

References

• http://github.com/Intermesh/groupoffice/commit/6c612deca97a6cd2a1bd4feea0ce7e8e9d907792
• https://github.com/Intermesh/groupoffice/security/advisories/GHSA-579w-jvg7-frr4
• https://github.com/Intermesh/groupoffice/security/advisories/GHSA-579w-jvg7-frr4

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