CVE-2026-33067 SiYuan has Stored XSS to RCE via Unsanitized Bazaar Package Metadata
Attackers can achieve remote code execution via stored XSS in SiYuan's Bazaar package metadata due to unsanitized fields and insecure Electron configuration.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33067?
CVE-2026-33067 is a medium-severity cross-site scripting vulnerability in B3log Siyuan, published on 20 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
SiYuan is a personal knowledge management system. Versions 3.6.0 and below render package metadata fields (displayName, description) using template literals without HTML escaping. A malicious package author can inject arbitrary HTML/JavaScript into these fields, which executes automatically when any user browses the Bazaar page. Because SiYuan's Electron configuration enables nodeIntegration: true with contextIsolation: false, this XSS escalates directly to full Remote Code Execution on the victim's operating system — with zero user interaction beyond opening the marketplace tab. This issue has been fixed in version 3.6.1.
Weakness: CWE-79
Which versions are affected by CVE-2026-33067?
3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260317012524-fe4523fff2c8 |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260317012524-fe4523fff2c8 |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260317012524-fe4523fff2c8 |
Products include B3log Siyuan.
How do I fix CVE-2026-33067?
Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260317012524-fe4523fff2c8 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-2026-33067 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33067 exists.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in B3log Siyuan
- CVE-2026-32938 SiYuan has an Arbitrary File Read in its Desktop Publish Service
- CVE-2026-33669 SiYuan has Arbitrary Document Reading within the Publishing Service
- CVE-2026-33670 SiYuan has directory traversal within its publishing service
- CVE-2026-32767 SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API
- CVE-2024-53504 SQL injection in n/a
Sources
Also known as GHSA-mvpm-v6q4-m2pf, GO-2026-4747.