CVE-2026-62278 in LubeLogger
Summary
by MITRE • 09/18/2026
LubeLogger is a self-hosted, open-source, web-based vehicle maintenance and fuel mileage tracker. Prior to 1.6.8, authenticated non-administrative users could reach HandleTranslationFileUpload and influence the name passed from Controllers/FilesController.cs to RenameFile in Helper/FileHelper.cs. RenameFile constructed newFilePath with string replacement and moved the uploaded file without verifying the resolved absolute path remained under the web root or data directory. A crafted upload name could therefore move an uploaded file outside the intended storage directory, enabling unauthorized file placement or overwrite with the privileges of the application process. This issue is fixed in version 1.6.8.
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Analysis
by VulDB Data Team • 09/18/2026
The vulnerability identified in LubeLogger versions prior to 1.6.8 represents a critical path traversal flaw within the application's file handling logic, specifically affecting authenticated non-administrative users. As an open-source web-based vehicle maintenance and fuel mileage tracker, LubeLogger relies on secure file operations for managing user-uploaded content such as receipts or images. The core of this vulnerability lies in the interaction between the HandleTranslationFileUpload endpoint located in Controllers/FilesController.cs and the RenameFile helper function found in Helper/FileHelper.cs. When a user uploads a file, the system processes the filename through string replacement mechanisms within RenameFile to construct a newFilePath variable. This process fails to adequately sanitize or validate the resulting absolute path against the intended storage directory boundaries.
From a technical perspective, this flaw constitutes an improper restriction of a pathname to a restricted directory, commonly categorized under CWE-22: Improper Limitation of a Pathname to a Restricted Directory. The application logic assumes that string replacements on filenames will result in safe paths within the web root or data directory. However, by manipulating the input filename with sequences such as dot-dot-slash (../) or other path traversal characters, an attacker can alter the resolved absolute path. Because the system does not verify that the final computed path remains contained within the expected storage location before executing the file move operation, it allows for arbitrary file placement outside of the designated sandboxed environment.
The operational impact of this vulnerability is severe due to its potential for unauthorized file manipulation with the privileges of the application process. An authenticated attacker can exploit this flaw to write files into sensitive areas of the server's filesystem. This capability enables several malicious outcomes, including overwriting critical configuration files, injecting web shells or backdoors into publicly accessible directories, or disrupting system integrity by modifying essential data files. Since LubeLogger runs as a service with specific file permissions, the attacker inherits these privileges during the write operation, potentially leading to full server compromise if combined with other exploitation techniques such as remote code execution via uploaded malicious scripts.
This vulnerability aligns with MITRE ATT&CK technique T1505.003: Web Shell, where attackers upload web shells to gain persistent access and execute arbitrary commands on the target system. It also reflects aspects of T1048: Exfiltration Over Alternative Protocol if the attacker uses the file placement capability to stage data for exfiltration through non-standard channels. The lack of strict path validation is a common oversight in applications that dynamically construct file paths based on user-supplied input without implementing robust canonicalization checks or chroot-like restrictions.
To mitigate this vulnerability, organizations must upgrade LubeLogger to version 1.6.8 or later, where the developers have implemented proper safeguards to ensure uploaded files remain within their intended directories. In environments where immediate upgrading is not feasible, administrators should implement strict input validation on all file upload endpoints, ensuring that filenames are sanitized and resolved paths are verified against a whitelist of allowed directories before any filesystem operations occur. Additionally, deploying web application firewalls with rules designed to detect path traversal attempts can provide an additional layer of defense by blocking requests containing suspicious directory navigation sequences. Regular security audits focusing on file handling logic in open-source applications are essential to prevent similar issues from being introduced or overlooked during development cycles.