TI-2026-26832 Aliases CVE-2026-34585 GHSA-ff66-236v-p4fg

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

HIGH 72CWE-79Published 2026-03-31 · Updated 2026-04-01

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting, Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79 and CWE-94.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00349 28th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed siyuan (siyuan-note): 3.6.2github.com/siyuan-note/siyuan/kernel (Go): 0.0.0-20260329142331-918d1bd9f967

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
siyuan-note	siyuan	before 3.6.2	3.6.2	Patch available	CNA
—	github.com/siyuan-note/siyuan/kernel (Go)	before 0.0.0-20260329142331-918d1bd9f967	0.0.0-20260329142331-918d1bd9f967	Patch available	GHSA-ff66-236v-p4fg

siyuan Vendorsiyuan-note Affected before 3.6.2 Fixed in 3.6.2 Patch available CNA
github.com/siyuan-note/siyuan/kernel (Go) Vendor— Affected before 0.0.0-20260329142331-918d1bd9f967 Fixed in 0.0.0-20260329142331-918d1bd9f967 Patch available GHSA-ff66-236v-p4fg

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:b3log:siyuan::::::::	before 3.6.2	Vulnerable	siyuan-note

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions before 3.6.2 Vulnerable ·siyuan-note

Remediation

Fix · CNA siyuan (siyuan-note) Fixed in 3.6.2
Fix · GHSA-ff66-236v-p4fg github.com/siyuan-note/siyuan/kernel (Go) Fixed in 0.0.0-20260329142331-918d1bd9f967 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-34585
2026-10-03 Alias added: GHSA-ff66-236v-p4fg

References

Exploit 1

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-34585

Other 4

TI-2026-26050 SiYuan has directory traversal within its publishing service CVSS 3.1CRITICAL 9.8
TI-2026-25256 SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API CVSS 3.1CRITICAL 9.8
TI-2024-35827 A SQL injection vulnerability was discovered in Siyuan 3.1.11 in /getHistoryItems. CVSS 3.1CRITICAL 9.8
TI-2024-35826 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the ids array parameter in /batchGetBlockAttrs. CVSS 3.1CRITICAL 9.8
TI-2024-35825 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the id parameter at /getAssetContent. CVSS 3.1CRITICAL 9.8
TI-2024-35824 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the notebook parameter in /searchHistory. CVSS 3.1CRITICAL 9.8

See all 54 →

Sources

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