TI-2026-19215 Aliases CVE-2026-23852

SiYuan vulnerable to Stored XSS / RCE via `setBlockAttrs` icon attribute

LOW 34CWE-94Published 2026-01-19 · Updated 2026-01-20

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94 and CWE-79.

Summary

SiYuan is a personal knowledge management system. Versions prior to 3.5.4 have a stored Cross-Site Scripting (XSS) vulnerability that allows an attacker to inject arbitrary HTML attributes into the `icon` attribute of a block via the `/api/attr/setBlockAttrs` API. The payload is later rendered in the dynamic icon feature in an unsanitized context, leading to stored XSS and, in the desktop environment, potential remote code execution (RCE). This issue bypasses the previous fix for issue `#15970` (XSS → RCE via dynamic icons). Version 3.5.4 contains an updated fix.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0081 57th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed siyuan (siyuan-note): 3.5.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

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 3.5.4	3.5.4	Patch available	CNA

siyuan Vendorsiyuan-note Affected before 3.5.4 Fixed in 3.5.4 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:b3log:siyuan::::::::	before 3.5.4	Vulnerable	siyuan-note

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions before 3.5.4 Vulnerable ·siyuan-note

Remediation

Fix · CNA siyuan (siyuan-note) Fixed in 3.5.4

Timeline

2026-10-02 Threatist record created from CVE-2026-23852

References

Exploit 1

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7c6g-g2hx-23vv

Patch 1

https://github.com/siyuan-note/siyuan/commit/0be7e1d4e0da9aac0da850b7aeb9b50ede7e5bdb

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

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences