CVE-2026-25512: Intermesh groupoffice · OS Command Injection
Affects Intermesh groupofficeSource CVE Database V5
Not known to be exploited · public detection template (Nuclei) · 20% EPSS · CVSS 9.4 Critical · fixed in 26.0.5 : patch Intermesh groupoffice as a priority.
Data as of 26 Oct 2026, 14:05 UTC
- EPSS
- 20.1% chance of exploitation in 30 days – higher than 97% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 26.0.5, 25.0.82, 6.8.150
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:HExploitation evidence
Disclosed: evidence found.
CVE published 4 Feb 2026
Detectable: evidence found.
nuclei template: Group-Office < 26.0.5 - Remote Code Execution
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade groupoffice and intermesh/groupoffice to 26.0.5, 25.0.82 or 6.8.150.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Intermeshgroupoffice | Affected
| Fixed in
|
| Intermeshgroupoffice | Affected
| Fixed in
|
| Intermeshgroupoffice | Affected
| Fixed in
|
GitHubintermesh/groupofficepkg:github/intermesh/groupofficeOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
- Immediately upgrade all Group-Office installations to versions 6.8.150, 25.0.82, or 26.0.5 or later, where the vulnerability is patched.
- Restrict access to the Group-Office application to trusted users and networks, employing network segmentation and zero-trust principles.
- Enforce strong authentication mechanisms such as multi-factor authentication (MFA) to reduce risk from compromised credentials.
- Conduct thorough input validation and sanitization reviews for all user-supplied parameters, especially those passed to system commands.
- Implement application-level monitoring and alerting for unusual command execution patterns or unexpected system calls.
- Regularly audit user accounts and permissions to minimize the number of users with access to vulnerable endpoints.
- Employ web application firewalls (WAFs) with custom rules to detect and block injection attempts targeting the tmp_file parameter.
- Maintain up-to-date backups and incident response plans to quickly recover from potential exploitation.
- Educate administrators and users about the risks of credential compromise and suspicious activity reporting.
- Monitor threat intelligence feeds for any emerging exploits related to this CVE to respond promptly.
Description
CVE-2026-25512 is a critical remote code execution vulnerability in Intermesh Group-Office versions prior to 6.8.150, 25.0.82, and 26.0.5. The flaw arises from improper neutralization of special elements in the tmp_file parameter, which is directly concatenated into an exec() system call within the email/message/tnefAttachmentFromTempFile endpoint. An authenticated attacker can exploit this by injecting shell metacharacters to execute arbitrary commands on the server without user interaction. This vulnerability impacts confidentiality, integrity, and availability of affected systems.