CVE-2026-73041

Received Received - Intake

SiYuan PDF Annotation Script Injection Vulnerability

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: VulnCheck

Description

SiYuan versions before v3.7.4 fail to validate or escape annotation fields written to disk by the setFileAnnotation endpoint. Attackers can inject malicious markup into annotation fields that execute as script in the PDF renderer with full Node.js access when a user opens an annotated PDF.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-15

Last Modified

2026-08-15

Generated

2026-08-16

AI Q&A

2026-08-16

EPSS Evaluated

N/A

NVD

CVE-2026-73041

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

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

Executive Summary

SiYuan versions before v3.7.4 have a flaw where annotation fields saved via the setFileAnnotation endpoint are not properly validated or escaped. This allows attackers to insert malicious markup into annotations that execute as script in the PDF renderer with full Node.js privileges when a user opens the PDF.

Detection Guidance

This vulnerability involves malicious markup in annotation fields that execute when a PDF is opened. Detection requires inspecting SiYuan note files for suspicious annotations or checking PDF exports for embedded scripts. No direct commands are provided in the context to detect this issue.

Impact Analysis

If you use SiYuan versions before v3.7.4 and open a PDF with malicious annotations, the injected script could gain full Node.js access, potentially allowing attackers to steal data, install malware, or take control of your system.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Upgrade SiYuan to version v3.7.4 or later to address the annotation field validation issue. Avoid opening PDFs from untrusted sources until patched.

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