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CVE-2026-34585

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

Published: Mar 31, 2026Updated: Apr 3, 2026 Sources: CVE List NVDCWE-79
8.6HIGH
NVD MITRE
EPSS Score
0.3%
Top 74.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:RS:CC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-79CWE-94

Affected Products

siyuanb3log
On-premWeb App
Web & CMS Plugins / cms-core
siyuansiyuan-note
On-prem
Consumer Software / productivity
b3logoss-projectWeb & CMS Pluginsaka b3log
siyuan-notecommercialConsumer Software

Exploitability

Official Patch Available
No detection template yetWe can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

3 techniques
Execution
Initial Access
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References

https://github.com/siyuan-note/siyuan/issues/17246
github.com
https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg
github.com

Timeline

Published
Mar 31, 2026
Last Updated
Apr 3, 2026

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