Vulnerability · Published Mar 31, 2026 · Assigned by GitHub_M
CVE-2026-34585SiYuan: Stored XSS in imported .sy.zip content leads to arbitrary command execution
High 8.6
In plain English
A high-severity cross-site scripting in siyuan from siyuan-note. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/siyuan-note/siyuan/kernel | 0.0.0-20260329142331-918d1bd9f967 | GHSA-ff66-236v-p4fg |
| Go | github.com/siyuan-note/siyuan/kernel | 0.0.0-20260329142331-918d1bd9f967 | GO-2026-5357 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| siyuan-note | siyuan | < 3.6.2 |
Weakness: CWE-79, CWE-94 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg x_refsource_CONFIRM
- https://github.com/siyuan-note/siyuan/issues/17246 x_refsource_MISC
- https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2 x_refsource_MISC