CVE-2026-3418 in API Control Plane
Summary
by MITRE • 08/07/2026
The System REST API accepts user-supplied file uploads without enforcing sufficient validation on the file type or destination, allowing files to be written to arbitrary server-accessible locations. Exploitation requires authenticated administrative access with publisher privileges.
Successful exploitation permits an authenticated publisher to upload files to server-accessible locations. Depending on the deployment environment and how uploaded files are handled, this could lead to the execution of uploaded content, potentially resulting in remote code execution.
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Analysis
by VulDB Data Team • 08/07/2026
This vulnerability represents a critical path traversal and insecure file upload flaw that undermines the fundamental security boundaries of web applications. The issue stems from insufficient input validation and inadequate access controls within the System REST API's file handling mechanisms, creating an exploitable condition where malicious actors can bypass normal file storage restrictions. The vulnerability is classified as a path traversal attack pattern under CWE-22, where the system fails to properly validate file paths before writing uploaded content to server directories. This weakness specifically targets the API's file destination validation logic, allowing attackers to specify arbitrary server paths through crafted file upload requests.
The technical implementation flaw manifests when the system accepts user-supplied file data without verifying either the file type or the intended storage location against a predefined whitelist of acceptable destinations. Authentication requirements for exploitation include administrative access with publisher privileges, which means this vulnerability operates within the context of legitimate users who already possess elevated permissions. However, the security model fails to enforce proper authorization boundaries at the file system level, enabling privilege escalation through unauthorized file placement. This scenario aligns with ATT&CK technique T1078.004 which describes valid accounts being used to perform actions that bypass security controls.
The operational impact of successful exploitation varies significantly based on deployment environment configurations and how uploaded files are subsequently processed by the application server. When uploaded files are stored in directories that are accessible via web requests, attackers can potentially execute malicious code through direct file access or by exploiting additional vulnerabilities in file handling processes. The vulnerability creates a potential attack vector for remote code execution depending on whether the system processes uploaded files as executable content, particularly when these files are placed in web-accessible directories or areas where the application server interprets file contents. This represents a serious compromise of the application's integrity and confidentiality controls, potentially allowing attackers to establish persistent access within the target environment.
Mitigation strategies should focus on implementing comprehensive input validation for both file types and destination paths, enforcing strict file extension whitelisting, and establishing clear authorization boundaries for file upload operations. The system must validate all file upload requests against a predefined set of acceptable destinations using absolute path validation rather than relative path manipulation. Security controls should include mandatory file type checking through content inspection, not just extension validation, and implement proper access control mechanisms to ensure that even authenticated users cannot bypass destination restrictions. Additionally, uploaded files should be stored in non-executable directories, and the application server should be configured to prevent execution of uploaded content in web-accessible areas. Organizations should also consider implementing file integrity monitoring and anomaly detection systems to identify suspicious file upload patterns that may indicate exploitation attempts.