CVE-2026-51880 in DeepTutor
Summary
by MITRE • 10/02/2026
deeptutor 1.4.0 contains a path traversal issue in EditFileTool.execute. Through the live tutorbot WebSocket interface, a remote caller can induce the tool layer to write or edit absolute paths outside the intended bot workspace.
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Analysis
by VulDB Data Team • 10/02/2026
The vulnerability identified in DeepTutor version 1.4.0 represents a critical security flaw within the application's file manipulation subsystem, specifically located in the EditFileTool.execute method. This component is responsible for handling requests to modify or create files associated with virtual tutoring bots. The core technical deficiency lies in the insufficient validation of user-supplied input before it is processed by the underlying operating system's file I/O routines. When a remote actor interacts with the live tutorbot WebSocket interface, they can transmit specially crafted commands that contain absolute path specifications rather than relative paths confined to the designated bot workspace directory. The application fails to sanitize or canonicalize these paths effectively, allowing an attacker to bypass intended access controls and write data to arbitrary locations on the host file system.
This path traversal vulnerability enables a remote code execution scenario with significant operational impact. By writing files outside the sandboxed environment of the tutorbot workspace, an attacker can potentially overwrite critical configuration files, inject malicious scripts into executable directories, or establish persistence mechanisms within the server's operating system. The use of absolute paths circumvents directory isolation measures that are typically employed to contain vulnerabilities within specific application contexts. If the service running DeepTutor operates with elevated privileges, such as root or a user with write access to system directories, the consequences can be severe, leading to full compromise of the underlying infrastructure. Even if run under restricted permissions, an attacker could still disrupt services by deleting essential files or causing denial of service conditions through resource exhaustion in unintended locations.
From a classification perspective, this flaw aligns directly with CWE-22: Improper Limitation of a Pathname to a Restricted Directory. This category encompasses vulnerabilities where software does not properly neutralize special elements within file paths that can cause the path to resolve outside of the intended directory structure. Furthermore, in the context of the MITRE ATT&CK framework, this vulnerability facilitates techniques related to Command and Control via Application Layer Protocol, as it allows an attacker to use the WebSocket interface for unauthorized data exfiltration or command injection. It also relates to Persistence mechanisms where attackers write files to system directories to maintain access after initial compromise. The exploitation vector is remote over a network protocol, which increases its severity rating significantly compared to local-only exploits.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. Immediately, DeepTutor version 1.4.0 should be updated to the latest patched release where this input validation issue has been resolved by developers implementing strict path canonicalization and directory traversal checks before file operations are executed. In environments where an upgrade is not immediately feasible, a network-level mitigation involves restricting WebSocket traffic to trusted internal networks only, thereby reducing the attack surface exposed to remote actors. Additionally, deploying Web Application Firewalls with rules capable of detecting and blocking absolute path patterns in POST or message body data can provide a layer of defense-in-depth.
For future development cycles, it is imperative that all file system interactions adhere to the principle of least privilege by ensuring application processes run under dedicated service accounts with minimal permissions confined strictly to their required workspace directories. Input validation should be implemented at multiple layers, including both client-side and server-side checks, but primarily enforced on the backend where trust boundaries are defined. Utilizing allowlists for permitted file extensions and directory structures is more secure than relying solely on deny lists for malicious characters like dot-dot-slash sequences. Regular security audits focusing on path handling logic in dynamic content generation tools will help prevent similar vulnerabilities from being introduced into other components of the platform.