PT-2026-29401 · Siyuan Note · Siyuan

Published 2026-03-31 · Updated 2026-03-31 · CVE-2026-34605

NVD

CVSS v4.0

8.6

High

AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-34605

Affected Products

Siyuan

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-34605 · Security Note
• https://github.com/siyuan-note/siyuan/issues/17246 · Note
• https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2 · Note
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-73g7-86qr-jrg3 · Note