CVE-2026-66396 Details
Description
SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation. Attackers with editor permissions can inject onload handlers that execute arbitrary code in the Electron renderer with full Node.js access when victims open affected documents.
A stored cross-site scripting vulnerability has been identified in SiYuan versions prior to 3.7.2. The issue arises from the application failing to properly escape the title-image Individual Attribute List (IAL) value when rendering cover images in Gallery and Kanban views. This oversight allows attackers with editor permissions to inject onload handlers into the style attribute, executing arbitrary code in the Electron renderer with full Node.js access when the affected document is opened.
Users can update to SiYuan version 3.7.2 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 27, 2026CISA-ADP
Assessed Jul 27, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34 | CISA-ADP | AdvisoryExploitTechnical AnalysisVendor |
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34 | [email protected] | AdvisoryExploitTechnical AnalysisVendor |
| https://www.vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ial | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| SiYuan | 3.7.1 (semver) |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 17, 2026 | CVE Modified | [email protected] |
| Sep 17, 2026 | CVE Modified | CISA-ADP |
| Jul 27, 2026 | CVE Modified | CISA-ADP |
| Jul 27, 2026 | New CVE Received | [email protected] |