Overview
CVE-2025-13815 is a medium-severity vulnerability identified in Mogu Blog v2, up to and including version 5.2. This vulnerability allows for unrestricted file uploads, potentially enabling attackers to upload malicious files and execute arbitrary code on the affected server. The vendor was contacted but did not respond.
Technical Details
The vulnerability resides in the /file/pictures endpoint of Mogu Blog v2. Specifically, the issue lies within an unknown function responsible for handling file uploads. By manipulating the filedatas argument, an attacker can bypass upload restrictions and upload any file type, including executable files. The exploit is publicly available, increasing the risk of exploitation.
CVSS Analysis
The Common Vulnerability Scoring System (CVSS) score for CVE-2025-13815 is 6.3 (Medium).
- Attack Vector: Network (AV:N)
- Attack Complexity: Low (AC:L)
- Privileges Required: None (PR:N)
- User Interaction: None (UI:N)
- Scope: Unchanged (S:U)
- Confidentiality Impact: Low (C:L)
- Integrity Impact: Low (I:L)
- Availability Impact: Low (A:L)
This score indicates that the vulnerability is remotely exploitable with low complexity and without requiring any user interaction or privileges. While the confidentiality, integrity, and availability impacts are only rated as low, the potential for remote code execution makes this a significant risk.
Possible Impact
Successful exploitation of CVE-2025-13815 could lead to the following:
- Remote Code Execution (RCE): Attackers can upload and execute malicious code on the server, potentially gaining complete control of the system.
- Website Defacement: Uploading malicious content to deface the website and damage its reputation.
- Data Theft: Accessing and stealing sensitive data stored on the server.
- Malware Distribution: Using the compromised server to host and distribute malware.
- Denial-of-Service (DoS): Uploading large files to exhaust server resources and cause a denial-of-service condition.
Mitigation or Patch Steps
Unfortunately, as the vendor has not responded to the disclosure, there is no official patch available. However, the following mitigation steps can be taken to reduce the risk:
- Implement Strict File Type Validation: Implement server-side validation to ensure that only allowed file types can be uploaded. Do not rely solely on client-side validation.
- Sanitize File Names: Sanitize uploaded file names to prevent malicious code injection.
- Restrict Upload Directory Permissions: Configure the upload directory to prevent the execution of uploaded files.
- Web Application Firewall (WAF): Utilize a Web Application Firewall (WAF) with rules to detect and block malicious file uploads.
- Regular Security Audits: Conduct regular security audits and penetration testing to identify and address potential vulnerabilities.
- Consider migrating to a more actively maintained blogging platform: If Mogu Blog is no longer supported, consider switching to a platform with better security practices and a responsive development team.
