CVE-2026-73041 SiYuan before v3.7.4 Remote Code Execution via PDF Annotations
Attackers can inject malicious markup into PDF annotations to execute arbitrary code with Node.js privileges when a user opens the file.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-73041?
CVE-2026-73041 is a critical cross-site scripting vulnerability in siyuan-note siyuan, published on 15 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
SiYuan versions before v3.7.4 fail to validate or escape annotation fields written to disk by the setFileAnnotation endpoint. Attackers can inject malicious markup into annotation fields that execute as script in the PDF renderer with full Node.js access when a user opens an annotated PDF.
Weakness: CWE-79
Which versions are affected by CVE-2026-73041?
How do I fix CVE-2026-73041?
No fix has been published for CVE-2026-73041 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-2026-73041 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73041 exists.
Sources
Also known as GHSA-vmpw-83v9-prcg.