CVE-2026-93923

SiYuan through 3.8.4 Stored XSS via Heading Style Attribute

Published: Sep 18, 2026Updated: Sep 21, 2026 Sources: CVE List NVDCWE-79

8.8HIGH

Description

SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting. Attackers can supply crafted notebooks or call administrative endpoints to inject malicious style values that execute in the Electron renderer with full system access.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-79

Affected Products

siyuan-note

commercial

siyuanOn-premDesktop App

Consumer Software / productivity

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx

github.com

https://github.com/siyuan-note/siyuan

github.com

https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76

github.com

and 3 more references View all →

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