CVE-2026-44670 SiYuan: Stored XSS via Attribute View name to Electron renderer RCE in SiYuan
Stored XSS in SiYuan allows remote code execution via Electron renderer due to unsafe HTML injection and insecure browser settings.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-44670?
CVE-2026-44670 is a critical cross-site scripting vulnerability in siyuan-note siyuan, published on 14 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, the kernel stores Attribute View (AV / database) names without any HTML escape, then a render template uses raw strings.ReplaceAll(tpl, "${avName}", nodeAvName) to embed the name in HTML before pushing to all clients via WebSocket. Three independent client paths (render.ts:120 → outerHTML, Title.ts:401 → innerHTML, transaction.ts:559 → innerHTML) consume the value without escaping. Because the main BrowserWindow runs nodeIntegration:true, contextIsolation:false, webSecurity:false (app/electron/main.js:407-411), HTML injection in the renderer becomes Node.js code execution. This vulnerability is fixed in 3.7.0.
Which versions are affected by CVE-2026-44670?
3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel.
| Package | Affected | Fixed in |
|---|---|---|
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260512140701-d7b77d945e0d |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260512140701-d7b77d945e0d |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260512140701-d7b77d945e0d |
How do I fix CVE-2026-44670?
Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260512140701-d7b77d945e0d or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-44670 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44670 exists.
Sources
Also known as GHSA-2h64-c999-c9r6, GO-2026-4992.