CVE-2025-9406 in lemon
Summary
by MITRE • 08/25/2025
A weakness has been identified in xuhuisheng lemon up to 1.13.0. This affects the function uploadImage of the file CmsArticleController.java of the component com.mossle.cms.web.CmsArticleController.uploadImage. This manipulation of the argument Upload causes unrestricted upload. The attack can be initiated remotely. The exploit has been made available to the public and could be exploited.
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Analysis
by VulDB Data Team • 09/13/2025
The vulnerability CVE-2025-9406 represents a critical security flaw in the xuhuisheng lemon application version 1.13.0 and earlier, specifically within the CmsArticleController.java component. This weakness manifests in the uploadImage function which handles file uploads through the Upload argument parameter. The vulnerability classification aligns with CWE-434 which describes insecure file upload handling, where the application fails to properly validate or restrict file types during the upload process. The flaw allows attackers to bypass normal file validation mechanisms and upload arbitrary files to the server, creating a dangerous pathway for remote code execution and system compromise.
The technical implementation of this vulnerability stems from insufficient input validation within the uploadImage function of the CmsArticleController class. When the Upload argument is processed, the application does not adequately verify file extensions, content types, or file signatures before storing uploaded files. This unrestricted upload capability enables attackers to submit malicious files such as web shells, executable binaries, or script files that can be executed on the target server. The vulnerability's remote exploitability means that attackers can initiate the attack without requiring physical access to the system, making it particularly dangerous for web applications that are publicly accessible. The availability of public exploits further amplifies the risk, as malicious actors can readily leverage this vulnerability without requiring advanced technical skills.
The operational impact of CVE-2025-9406 extends beyond simple unauthorized file uploads, creating a comprehensive attack surface that can lead to complete system compromise. Successful exploitation allows attackers to execute arbitrary code on the server, potentially leading to data breaches, system infiltration, and persistent access. The vulnerability affects the core content management functionality of the application, compromising the integrity of the CMS system and potentially enabling attackers to modify or delete critical content. From an ATT&CK framework perspective, this vulnerability maps to T1190 (Exploit Public-Facing Application) and T1059 (Command and Scripting Interpreter) techniques, as attackers can leverage the unrestricted upload to establish command execution capabilities. The compromised system may also serve as a pivot point for lateral movement within network environments, especially if the application server has access to internal resources.
Organizations affected by this vulnerability should implement immediate mitigations including strict file type validation, content verification, and proper file storage practices. The recommended approach involves implementing a whitelist of allowed file extensions, validating file content through magic number checking, and storing uploaded files outside the web root directory. Additionally, implementing proper access controls and monitoring for suspicious file upload activities can help detect exploitation attempts. Security teams should also consider implementing web application firewalls and intrusion detection systems to monitor for exploitation patterns. The vulnerability demonstrates the critical importance of input validation in web applications and aligns with security best practices outlined in OWASP Top 10, specifically addressing the A04:2021-Insecure Design principle. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other application components, ensuring comprehensive protection against similar attack vectors.