Sangfor OSM - Arbitrary File Upload (CVE-2025-15503)

CVE-2025-15503 is a critical arbitrary file upload vulnerability in Sangfor Operation and Maintenance Management System (OSM) versions up to 3.0.8. Due to missing file type validation on the upload endpoint, unauthenticated remote attackers can upload malicious files such as JSP web shells, leading to full remote code execution and system compromise.

CrowdSec has been tracking this vulnerability and its exploits since 1st of March 2025.

Data from the CrowdSec community indicates that exploitation of CVE-2025-15503 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2025-15503 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2025-15503 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

Attackers exploit the /fort/trust/version/common/common.jsp endpoint by sending multipart POST requests with malicious JSP files, which are then accessible on the server for remote code execution.