EUVD-2026-17685
GHSA-ff66-236v-p4fg
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Lifecycle Timeline
4Description
SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2.
Analysis
Stored cross-site scripting (XSS) in SiYuan personal knowledge management system versions prior to 3.6.2 escalates to remote code execution in the Electron desktop client. Attackers craft malicious .sy.zip import files containing HTML entities mixed with raw special characters that bypass server-side attribute escaping, injecting event handlers into imported notes. …
Sign in for full analysis, threat intelligence, and remediation guidance.
Remediation
Within 24 hours: Identify all SiYuan deployments and users (check installed versions via Help > About or local filesystem inspection). Communicate import restriction advisory to users-do not open .sy.zip files from untrusted sources. …
Sign in for detailed remediation steps.
Priority Score
Share
External POC / Exploit Code
Leaving vuln.today