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Vulnerability details

CVE-2026-34585

siyuan-note siyuan

SiYuan: Stored XSS in imported .sy.zip content leads to arbitrary command execution

CVSS 3.1
8.6High

Official description

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.

CVSS scores

ScoreVersionSourceVector
8.6High 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
siyuan-note siyuan < 3.6.2 CVEProject cvelistV5 (CNA)

References and advisories

3
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Details

Published
2026-04-01
Last updated
2026-04-01
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.34%
Probability of exploitation in 30 days
28.6%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-79
    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • CWE-94
    Improper Control of Generation of Code ('Code Injection')