CVE-2026-25512 Group-Office is vulnerable to RCE due to Command Injection via TNEF Attachment Handler
An authenticated attacker can execute arbitrary system commands on Group-Office servers by injecting shell metacharacters into the TNEF attachment handler.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-25512?
CVE-2026-25512 is a critical command injection vulnerability in Intermesh groupoffice, published on 4 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-78
Which versions are affected by CVE-2026-25512?
It affects 1 product.
Products include Group-Office Group Office.
How do I fix CVE-2026-25512?
No fix has been published for CVE-2026-25512 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-25512 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25512 exists.
Public exploit code: 1 Nuclei template and 2 proofs of concept on GitHub.
Other vulnerabilities in Intermesh groupoffice
- CVE-2026-25134 Group-Office Argument Injection in MaintenanceController::actionZipLanguage
- CVE-2025-63406 Code injection in n/a
- CVE-2026-25511 Group-Office is vulnerable to SSRF and File Read in WOPI service discovery
- CVE-2023-46730 Server-Side Request Forgery in groupoffice
- CVE-2025-25191 Group-Office has a Stored XSS Vulnerability via user's name field
Sources
Also known as GHSA-579w-jvg7-frr4.