What’s Vulnerable › Vulnerabilities

CVE-2026-66396: SiYuan before v3.7.2 Stored XSS to RCE via title-img IAL

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-27 · updated 2026-10-24
• Weakness: CWE-79

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.

Affected products

• siyuan-note siyuan: before 3.7.2 — fixed in 3.7.2

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.2. Check the vendor advisory for mitigations.

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34
• https://www.vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ial
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34

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