CVE-2026-116169
Deferred Deferred - Pending Action

SiYuan Stored XSS via KaTeX Math Block

Publication date: 2026-10-25

Last updated on: 2026-10-25

Assigner: VulnCheck

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-25
Last Modified
2026-10-25
Generated
2026-10-25
AI Q&A
2026-10-25
EPSS Evaluated
N/A
NVD
CVE-2026-116169
EUVD
EUVD-2026-109430

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
siyuan-note siyuan 2.10.0

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in SiYuan versions 2.10.0 to 3.8.6. Users with edit permissions can inject malicious JavaScript by inserting javascript: URLs in math block content rendered with KaTeX's trust mode enabled. The vulnerability occurs because SiYuan uses innerHTML to render math blocks without proper sanitization, allowing attackers to execute scripts when victims click rendered links.

Impact Analysis

An attacker with edit rights could inject malicious scripts that execute when other users view the affected math blocks. This may lead to session hijacking, unauthorized actions on behalf of the user, or theft of sensitive data. The impact depends on user privileges and the nature of the injected payload.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA requirements for data protection and access controls. Organizations using affected SiYuan versions may face compliance risks if user data is compromised through XSS exploitation.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-116169. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart