CVE-2026-85688 in Ten Framework
Summary
by MITRE • 09/04/2026
TEN Framework 0.11.71 contains unauthenticated arbitrary file read and write vulnerabilities in the TMAN Designer file-content API endpoints. Attackers can submit POST and PUT requests to the /api/designer/v1/file-content endpoints to read arbitrary files or write malicious content to system paths, enabling code execution through authorized_keys, cron files, or executable graph files.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified in TEN Framework version 0.11.71 represents a critical security failure within the TMAN Designer component, specifically affecting its file-content API endpoints. This flaw allows unauthenticated attackers to perform arbitrary file read and write operations on the underlying operating system. The core technical issue stems from insufficient input validation and path traversal checks in the handling of POST and PUT requests directed at the /api/designer/v1/file-content endpoint. By manipulating the parameters associated with these HTTP methods, an attacker can bypass intended access controls to interact directly with the file system without requiring valid authentication credentials or session tokens. This lack of authorization enforcement combined with improper path sanitization creates a direct pathway for remote code execution and data exfiltration.
From a technical perspective, the arbitrary read vulnerability enables attackers to extract sensitive information stored on the server. By constructing specific requests that utilize directory traversal sequences such as dot-dot-slash or encoded variants thereof, an attacker can access files outside of the designated application directories. This capability allows for the theft of configuration files containing database credentials, API keys, private certificates, and other secrets essential for maintaining system integrity. The arbitrary write vulnerability is equally dangerous, as it permits the injection of malicious content into critical system locations. Attackers can overwrite existing files or create new ones in writable directories, leveraging these writes to establish persistence or escalate privileges within the compromised environment.
The operational impact of this vulnerability extends far beyond simple data leakage, primarily due to the potential for remote code execution through specific file types and system mechanisms. An attacker with write access can manipulate authorized_keys files on Linux-based systems to inject public SSH keys, thereby gaining persistent shell access without needing passwords or multi-factor authentication. Alternatively, by writing malicious scripts into cron directories, an attacker can schedule automated tasks that execute arbitrary commands at regular intervals, ensuring continued control even if initial entry points are patched or detected. Furthermore, the ability to write executable graph files within the TEN Framework itself allows for the execution of custom logic defined in these graphs, effectively turning a design tool into a vector for running malicious code with the privileges of the application process.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) categories such as CWE-284 Improper Access Control and CWE-732 Incorrect Permission Assignment for Critical Resource. The unauthenticated nature of the exploit maps directly to MITRE ATT&CK techniques including T1059 Command and Scripting Interpreter, particularly when leveraging cron or shell scripts, and T1505 Server Software Component, where malicious components are installed via file writes. Additionally, the ability to read arbitrary files corresponds to CWE-200 Information Exposure, while the write capabilities relate to CWE-436 Interpretation Conflict if path resolution is manipulated to overwrite unintended targets. The severity of this issue is compounded by its unauthenticated status, meaning any entity with network access to the API endpoint can exploit it without prior compromise or credential theft.
Mitigation strategies must prioritize immediate patching and architectural hardening. Organizations running TEN Framework 0.11.71 should upgrade to a patched version where these input validation flaws have been resolved by developers. In cases where upgrading is not immediately feasible, network-level controls such as Web Application Firewalls can be configured to block requests containing path traversal sequences or suspicious file extensions targeting sensitive system paths like /etc/ssh or cron directories. Access control lists should restrict API endpoint visibility to trusted internal networks only, and strict authentication requirements must be enforced for all designer-related endpoints. Regular auditing of file permissions and monitoring for unauthorized modifications to critical system files can also help detect exploitation attempts early.