Vulnerability · Published Oct 25, 2026 · Assigned by VulnCheck

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

Medium 5.4

In plain English

A medium-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 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 89.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	2.10.0 – before 3.8.7

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-hhvq-jqv9-pgjq) vendor-advisory
VulnCheck Advisory: SiYuan 2.10.0 before 3.8.7 Stored XSS via KaTeX \href in Math Blocks third-party-advisory