CVE-2026-64879 in Security Center
Summary
by MITRE • 07/21/2026
A filename supplied during file upload is not properly sanitized before being used in system command execution, allowing an attacker to inject shell metacharacters and achieve command injection via the audit file upload functionality.
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Analysis
by VulDB Data Team • 07/21/2026
This vulnerability represents a critical command injection flaw that arises from inadequate input validation during file upload processes within audit systems. The security weakness occurs when user-supplied filenames are directly incorporated into system commands without proper sanitization or escaping mechanisms, creating an avenue for malicious actors to execute arbitrary shell commands on the affected system. The vulnerability stems from improper handling of untrusted data within a context that executes operating system commands, which aligns with common weak practices identified in CWE-78 and CWE-89 categories.
The technical exploitation involves an attacker uploading a file with a maliciously crafted filename containing shell metacharacters such as semicolons, pipes, or backticks that get interpreted by the underlying shell when the audit functionality processes the upload. This allows the attacker to inject additional commands that execute with the privileges of the vulnerable application, potentially leading to complete system compromise. The attack vector specifically targets command execution contexts where file paths are constructed dynamically from user input, making it particularly dangerous in environments where audit logging and file processing functions are present.
From an operational impact perspective, this vulnerability can result in severe consequences including unauthorized access to sensitive data, privilege escalation to system administrators, and potential lateral movement within network environments. The attacker could leverage this weakness to establish persistent backdoors, exfiltrate confidential information, or disrupt system operations through destructive command execution. The vulnerability is especially concerning in audit systems where file uploads are common and often involve processing of potentially malicious content from untrusted sources. According to ATT&CK framework, this maps to T1059.004 (Unix Shell) and T1021.004 (SSH) techniques, as attackers could gain shell access through command injection.
Effective mitigations include implementing strict input validation and sanitization of all user-supplied filenames before any system command execution occurs, utilizing parameterized command execution where possible, and employing proper escaping mechanisms for shell metacharacters. Organizations should implement a whitelist approach for acceptable filename characters and lengths, avoid concatenating user input directly into shell commands, and consider using secure file handling libraries that automatically escape special characters. Additionally, privilege separation techniques should be employed to ensure that the application executes with minimal necessary permissions, reducing potential damage from successful exploitation. Regular security testing including dynamic analysis and penetration testing can help identify similar vulnerabilities in other parts of the application stack where user input is processed in system contexts.