CVE-2026-25512 in GroupOffice
Summary
by MITRE • 02/04/2026
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.
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Analysis
by VulDB Data Team • 02/12/2026
The vulnerability CVE-2026-25512 represents a critical remote code execution flaw in Group-Office, a widely used enterprise customer relationship management and groupware platform. This vulnerability affects multiple version lines including 6.8.x prior to 6.8.150, 25.0.x prior to 25.0.82, and 26.0.x prior to 26.0.5, indicating a significant security gap that has persisted across different release branches. The flaw exists within the email/message/tnefAttachmentFromTempFile endpoint where user-controlled input is directly concatenated into an exec() system call without proper sanitization or validation. This type of vulnerability falls under CWE-78, which specifically addresses Improper Neutralization of Special Elements used in an OS Command, making it a classic command injection vulnerability that can be exploited to execute arbitrary system commands.
The technical exploitation of this vulnerability requires an authenticated attacker who can manipulate the tmp_file parameter through the affected endpoint. When an attacker injects shell metacharacters such as semicolons, ampersands, or other command chaining operators into the tmp_file parameter, the system executes these commands with the privileges of the web application. This allows for complete system compromise, including potential privilege escalation, data exfiltration, and further network reconnaissance. The vulnerability demonstrates a fundamental lack of input validation and proper sanitization of user-provided data before system command execution, creating a direct pathway for attackers to bypass authentication mechanisms and gain unauthorized access to the underlying server infrastructure. The attack vector is particularly concerning because it leverages legitimate application functionality to execute malicious code, making detection more challenging.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with complete control over the affected Group-Office server. An attacker could potentially install backdoors, modify or delete sensitive customer data, access other systems within the network, and use the compromised server as a pivot point for further attacks. The vulnerability affects enterprise environments where Group-Office is deployed for customer relationship management, making it particularly dangerous as it could expose sensitive business data, personal information, and proprietary corporate communications. Organizations using affected versions face significant risk of data breaches, regulatory compliance violations, and potential legal consequences due to the exposure of critical business information. This vulnerability aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter, specifically targeting the execution of system commands through the web application interface.
Mitigation strategies for CVE-2026-25512 require immediate patching of all affected Group-Office installations to versions 6.8.150, 25.0.82, and 26.0.5 where the vulnerability has been addressed. Organizations should also implement network segmentation and access controls to limit exposure of the Group-Office application to untrusted networks. Additional defensive measures include implementing web application firewalls, monitoring for suspicious command execution patterns, and conducting thorough security audits of the application's input validation mechanisms. Security teams should also review and strengthen authentication controls, implement multi-factor authentication, and establish comprehensive monitoring for unusual system activity that might indicate exploitation attempts. The vulnerability serves as a reminder of the critical importance of proper input validation and the principle of least privilege in web application security, emphasizing that all user-provided data must be rigorously sanitized before being processed by system commands.