Siyuan's /api/template/renderSprig endpoint is vulnerable to Server-Side Template Injection (SSTI) through the Sprig template engine. Although the engine has limitations, it allows attackers to access environment variables
The /api/asset/upload endpoint in Siyuan is vulnerable to both arbitrary file write to the host and stored XSS (via the file write).
An arbitrary file read vulnerability exists in Siyuan's /api/template/render endpoint. The absence of proper validation on the path parameter allows attackers to access sensitive files on the host system.
Siyuan's /api/export/exportResources endpoint is vulnerable to arbitary file read via path traversal. It is possible to manipulate the paths parameter to access and download arbitrary files from the host system by traversing the workspace directory structure.