What’s Vulnerable › Vulnerabilities

CVE-2026-116169: SiYuan 2.10.0 before 3.8.7 Stored XSS via KaTeX \href in Math Blocks

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-25 · updated 2026-10-29
• Weakness: CWE-79

Description

SiYuan from 2.10.0 before 3.8.7 contains a stored cross-site scripting vulnerability that allows users with edit permission to inject script by placing javascript: URLs in math block content rendered with KaTeX trust enabled. Attackers can store \href, \url, or \includegraphics payloads that mathRender assigns via innerHTML, executing script in the application origin when a reader clicks the rendered link.

Affected products

• siyuan-note siyuan: from 2.10.0 before 3.8.7 — fixed in 3.8.7

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.8.7. Check the vendor advisory for mitigations.

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhvq-jqv9-pgjq
• https://www.vulncheck.com/advisories/siyuan-2.10.0-before-3.8.7-stored-xss-via-katex-href-in-math-blocks
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhvq-jqv9-pgjq

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