CVE-2026-12540 in Foreman
Summary
by MITRE • 10/01/2026
A flaw was found in Foreman. A command injection vulnerability exists in the foreman-rake errors:fetch_log task. The request_id parameter is passed to an underlying system command (typically grep) without adequate shell neutralization. While the task is intended to fetch specific log entries, an attacker with sudo permissions to execute this rake task can inject shell metacharacters (such as ;, ", or |) to break out of the intended command and execute arbitrary code.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability identified in Foreman represents a critical security flaw rooted in improper input validation within the foreman-rake errors:fetch_log task. This specific component is designed to retrieve log entries associated with a given request identifier, facilitating operational troubleshooting for system administrators. However, the implementation fails to adequately sanitize or neutralize shell metacharacters present in the user-supplied request_id parameter before passing it to an underlying operating system command, typically grep. This lack of proper input handling creates a classic command injection vector, allowing malicious actors who possess sudo privileges restricted to executing this specific rake task to bypass intended functionality and achieve arbitrary code execution on the host system.
From a technical perspective, the core issue lies in the direct interpolation of unsanitized user input into a shell command string. When an attacker provides a request_id containing special characters such as semicolons, pipes, or double quotes, these characters are interpreted by the shell rather than treated as literal data. For instance, appending a semicolon followed by arbitrary commands allows the injected payload to execute in the context of the user running the rake task. Since this task is accessible via sudo with elevated privileges, the resulting command execution inherits those permissions, potentially granting the attacker full control over the Foreman server or access to sensitive internal resources depending on the specific configuration and scope of the sudo rules.
The operational impact of this vulnerability is severe due to its potential for privilege escalation and remote code execution within the management infrastructure. An authenticated user with limited sudo rights can leverage this flaw to escalate their privileges significantly, potentially compromising not only the Foreman application but also other services running on the same host. This could lead to unauthorized access to configuration files, database credentials, or network configurations managed by Foreman. Furthermore, in environments where Foreman integrates with external systems via API calls triggered from log processing workflows, this compromise could serve as a pivot point for broader lateral movement within the infrastructure.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) identifiers such as CWE-78 Improper Neutralization of Special Elements used in an OS Command and CWE-94 Improper Control of Generation of Code. In terms of attack patterns, it corresponds to MITRE ATT&CK techniques related to command and script interpretation, specifically T1059 which covers various scripting languages and shell commands. The exploitation relies on the attacker's ability to inject payloads that alter the structure of the executed command, a fundamental failure in secure coding practices regarding external input handling.
Mitigation strategies should focus primarily on patching the Foreman installation to include updates from upstream developers who have addressed this specific injection flaw by implementing strict parameterization or safe shell escaping mechanisms for the request_id argument. In addition to applying software patches, administrators should review and restrict sudo configurations to adhere to the principle of least privilege, ensuring that rake tasks do not unnecessarily grant broad system access unless absolutely required. Implementing web application firewalls or input validation layers at the proxy level can also provide an additional defense-in-depth measure by filtering out suspicious shell metacharacters before they reach the Foreman backend. Regular security audits and static code analysis tools should be employed to detect similar patterns of unsafe command execution in other parts of the application stack.