CVE-2026-75917 SiYuan before v3.7.4 XSS-to-RCE via pathName.ts
Attackers can execute arbitrary OS commands by injecting XSS payloads into document metadata fields, exploiting Electron's insecure configuration in SiYuan.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-75917?
CVE-2026-75917 is a critical cross-site scripting vulnerability in siyuan-note siyuan, published on 19 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file-tree picker's hover-tooltip generation (app/src/util/pathName.ts, getLeaf()/movePathTo()) used by the 'move/link to' path-selection dialogs, where document metadata fields (bookmark, alias, memo, and an alternate name field) are concatenated into the aria-label HTML attribute without escaping. A document crafted with a double quote in any of these fields breaks out of the attribute context and injects arbitrary HTML attributes including inline event handlers (e.g., onmouseover). Because every SiYuan Electron BrowserWindow runs with nodeIntegration:true, contextIsolation:false, and no CSP, the injected handler gains require('child_process') access, escalating the XSS to arbitrary OS command execution when a victim merely hovers over the malicious document entry in the path-picker dialog. Malicious documents reach victims via sharing, sync, or import.
Weakness: CWE-79
Which versions are affected by CVE-2026-75917?
How do I fix CVE-2026-75917?
No fix has been published for CVE-2026-75917 yet. Limit exposure of the affected software until one is available.
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-2026-75917 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75917 exists.
Sources
Also known as GHSA-w6j4-pg6w-qwj7.