CVE-2026-31807
Description
SiYuan is a personal knowledge management system. Prior to 3.5.10, SiYuan's SVG sanitizer (SanitizeSVG) blocks dangerous elements (<script>, <iframe>, <foreignobject>) and removes on* event handlers and javascript: in href attributes. However, it does NOT block SVG animation elements (<animate>, <set>) which can dynamically set attributes to dangerous values at runtime, bypassing the static sanitization. This allows an attacker to inject executable JavaScript into the unauthenticated /api/icon/getDynamicIcon endpoint (type=8), creating a reflected XSS. This is a bypass of the fix for CVE-2026-29183 (fixed in v3.5.9). This vulnerability is fixed in v3.5.10.
How to fix
- b3log siyuan3.5.10 or later
- github.com/siyuan-note/siyuan/kernel0.0.0-20260310025236-297bd526708f or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| b3log siyuan | v < 3.5.10 | 3.5.10 |
| github.com/siyuan-note/siyuan/kernelGo | v < 0.0.0-20260310025236-297bd526708f | 0.0.0-20260310025236-297bd526708f |
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