Executive brief
MCMS, a popular open-source Java content management system, contains a security flaw in its file upload functionality. An attacker can upload a specially crafted file to the server, which could allow them to run unauthorized code. This could lead to a complete takeover of the website, data theft, or disruption of services.
Technical details
An arbitrary file upload vulnerability exists in MCMS (up to and including version 6.0.1) within the file upload component. The flaw is located at the /ms/file/upload.do endpoint, where insufficient validation of uploaded files allows an attacker to bypass security restrictions. By uploading a malicious file (such as a web shell), a remote, unauthenticated attacker can achieve arbitrary code execution on the underlying server. While some references categorize this as XSS, the primary impact reported is arbitrary code execution via file upload. Users are advised to monitor the official repository for patches or implement strict file extension filtering at the application or web server level.
Affected products
- mingSoft MCMS <= 6.0.1
Timeline
- 2025-10-10: disclosed: Initial disclosure of CVE-2025-60838