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TI-2026-26852 Aliases CVE-2026-34605GHSA-73g7-86qr-jrg3

SiYuan: Reflected XSS via SVG namespace prefix bypass in SanitizeSVG ( getDynamicIcon, unauthenticated )

Priority HIGH 72CWE-79Published · Updated

Key facts

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

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

Summary

SiYuan is a personal knowledge management system. From version 3.6.0 to before version 3.6.2, the SanitizeSVG function introduced in version 3.6.0 to fix XSS in the unauthenticated /api/icon/getDynamicIcon endpoint can be bypassed by using namespace-prefixed element names such as <x:script xmlns:x="http://www.w3.org/2000/svg">. The Go HTML5 parser records the element's tag as "x:script" rather than "script", so the tag check passes it through. The SVG is served with Content-Type: image/svg+xml and no Content Security Policy; when a browser opens the response directly, its XML parser resolves the prefix to the SVG namespace and executes the embedded script. 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 0.00469 40th 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): 0.0.0-20260330031106-f09953afc57a

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

VendorProductAffected versionsFixed inStatusSource
siyuan-notesiyuan3.6.0 to before 3.6.23.6.2Patch availableCNA
—github.com/siyuan-note/siyuan/kernel (Go)before 0.0.0-20260330031106-f09953afc57a0.0.0-20260330031106-f09953afc57aPatch availableGHSA-73g7-86qr-jrg3
  • siyuan Vendorsiyuan-note Affected 3.6.0 to before 3.6.2 Fixed in 3.6.2 Patch available CNA
  • github.com/siyuan-note/siyuan/kernel (Go) Vendor— Affected before 0.0.0-20260330031106-f09953afc57a Fixed in 0.0.0-20260330031106-f09953afc57a Patch available GHSA-73g7-86qr-jrg3

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*3.6.0 to before 3.6.2Vulnerablesiyuan-note
  • cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions 3.6.0 to before 3.6.2 Vulnerable ·siyuan-note

Remediation

  • Fix · CNA siyuan (siyuan-note) Fixed in 3.6.2
  • Fix · GHSA-73g7-86qr-jrg3 github.com/siyuan-note/siyuan/kernel (Go) Fixed in 0.0.0-20260330031106-f09953afc57a Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34605
  2. 2026-10-03 Alias added: GHSA-73g7-86qr-jrg3

References

Exploit 1

Advisory 1

Other 3

  • 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