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TI-2026-19039 Aliases CVE-2026-23645GHSA-pcjq-j3mq-jv5j

SiYuan Vulnerable to Stored Cross-Site Scripting (XSS) via Unrestricted SVG File Upload

Priority MEDIUM 57CWE-79Published · Updated

Key facts

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

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

Summary

SiYuan is self-hosted, open source personal knowledge management software. Prior to 3.5.4-dev2, a Stored Cross-Site Scripting (XSS) vulnerability exists in SiYuan Note. The application does not sanitize uploaded SVG files. If a user uploads and views a malicious SVG file (e.g., imported from an untrusted source), arbitrary JavaScript code is executed in the context of their authenticated session. This vulnerability is fixed in 3.5.4-dev2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0028 20th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed siyuan (siyuan-note): 3.5.4-dev2github.com/siyuan-note/siyuan/kernel (Go): 0.0.0-20260116101155-11115da3d0de

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
siyuan-notesiyuanbefore 3.5.4-dev23.5.4-dev2Patch availableCNA
—github.com/siyuan-note/siyuan/kernel (Go)before 0.0.0-20260116101155-11115da3d0de0.0.0-20260116101155-11115da3d0dePatch availableGHSA-pcjq-j3mq-jv5j
  • siyuan Vendorsiyuan-note Affected before 3.5.4-dev2 Fixed in 3.5.4-dev2 Patch available CNA
  • github.com/siyuan-note/siyuan/kernel (Go) Vendor— Affected before 0.0.0-20260116101155-11115da3d0de Fixed in 0.0.0-20260116101155-11115da3d0de Patch available GHSA-pcjq-j3mq-jv5j

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*before 3.5.4Vulnerablesiyuan-note
cpe:2.3:a:b3log:siyuan:3.5.4:dev1:*:*:*:*:*:*3.5.4 dev1Vulnerablesiyuan-note
  • cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions before 3.5.4 Vulnerable ·siyuan-note
  • cpe:2.3:a:b3log:siyuan:3.5.4:dev1:*:*:*:*:*:* Versions 3.5.4 dev1 Vulnerable ·siyuan-note

Remediation

  • Fix · CNA siyuan (siyuan-note) Fixed in 3.5.4-dev2
  • Fix · GHSA-pcjq-j3mq-jv5j github.com/siyuan-note/siyuan/kernel (Go) Fixed in 0.0.0-20260116101155-11115da3d0de Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23645
  2. 2026-10-03 Alias added: GHSA-pcjq-j3mq-jv5j

References

Exploit 1

Patch 2

Advisory 1

Other 1

  • 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