SiYuan Affected by Zero-Click NTLM Hash Theft and Blind SSRF via Mermaid Diagram Rendering

SiYuan configures Mermaid.js with securityLevel: "loose" and htmlLabels: true. In this mode, tags with src attributes survive Mermaid's internal DOMPurify and land in SVG blocks. The SVG is injected via innerHTML with no secondary sanitization. When a victim opens a note containing a malicious...

PT-2026-31734

Name of the Vulnerable Software and Affected Versions SiYuan versions prior to 3.6.4 Description SiYuan, a personal knowledge management system, prior to version 3.6.4, configured Mermaid.js with 'securityLevel: "loose"' and 'htmlLabels: true'. This configuration allowed tags with 'src' attribute...