TI-2026-28728 Aliases CVE-2026-39846 GHSA-phhp-9rm9-6gr2

SiYuan affected by Remote Code Execution in the Electron desktop client via stored XSS in synced table captions

HIGH 74CWE-79Published 2026-04-07 · Updated 2026-04-08

Key facts

Attack vector: Network
Privileges required: Low
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 3.6.4, a malicious note synced to another user can trigger remote code execution in the SiYuan Electron desktop client. The root cause is that table caption content is stored without safe escaping and later unescaped into rendered HTML, creating a stored XSS sink. Because the desktop renderer runs with nodeIntegration enabled and contextIsolation disabled, attacker-controlled JavaScript executes with access to Node.js APIs. In practice, an attacker can import a crafted note into a synced workspace, wait for the victim to sync, and achieve code execution when the victim opens the note. This vulnerability is fixed in 3.6.4.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00559 46th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed siyuan (siyuan-note): 3.6.4github.com/siyuan-note/siyuan/kernel (Go): 0.0.0-20260407035653-2f416e5253f1

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 3.6.4	3.6.4	Patch available	CNA
—	github.com/siyuan-note/siyuan/kernel (Go)	before 0.0.0-20260407035653-2f416e5253f1	0.0.0-20260407035653-2f416e5253f1	Patch available	GHSA-phhp-9rm9-6gr2

siyuan Vendorsiyuan-note Affected before 3.6.4 Fixed in 3.6.4 Patch available CNA
github.com/siyuan-note/siyuan/kernel (Go) Vendor— Affected before 0.0.0-20260407035653-2f416e5253f1 Fixed in 0.0.0-20260407035653-2f416e5253f1 Patch available GHSA-phhp-9rm9-6gr2

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:b3log:siyuan::::::::	before 3.6.4	Vulnerable	siyuan-note

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions before 3.6.4 Vulnerable ·siyuan-note

Remediation

Fix · CNA siyuan (siyuan-note) Fixed in 3.6.4
Fix · GHSA-phhp-9rm9-6gr2 github.com/siyuan-note/siyuan/kernel (Go) Fixed in 0.0.0-20260407035653-2f416e5253f1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-39846
2026-10-03 Alias added: GHSA-phhp-9rm9-6gr2
2026-10-14 EPSS moved to the 50th–90th percentile
2026-10-25 EPSS moved to the below the 50th percentile

References

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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