CVE-2026-73041: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in siyuan-note siyuan
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.
AI Analysis
Technical Summary
CVE-2026-73041 is a critical cross-site scripting vulnerability in SiYuan note-taking software versions prior to 3.7.4. The flaw arises because annotation fields written to disk by the setFileAnnotation endpoint are not properly validated or escaped. An attacker can inject malicious markup into these annotation fields, which executes as script within the PDF renderer component. This script execution occurs with full Node.js privileges when a user opens an annotated PDF, potentially allowing extensive control over the affected system.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary scripts with full Node.js access in the context of the PDF renderer. This can lead to complete compromise of the user's environment running SiYuan, including unauthorized code execution and potential data theft or system manipulation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided at this time. Users should monitor vendor communications for updates and avoid opening annotated PDFs from untrusted sources until a fix is available.
CVE-2026-73041: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in siyuan-note siyuan
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 v4.0
Score 9.4critical
Affected software
siyuan-note
siyuan
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-73041 is a critical cross-site scripting vulnerability in SiYuan note-taking software versions prior to 3.7.4. The flaw arises because annotation fields written to disk by the setFileAnnotation endpoint are not properly validated or escaped. An attacker can inject malicious markup into these annotation fields, which executes as script within the PDF renderer component. This script execution occurs with full Node.js privileges when a user opens an annotated PDF, potentially allowing extensive control over the affected system.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary scripts with full Node.js access in the context of the PDF renderer. This can lead to complete compromise of the user's environment running SiYuan, including unauthorized code execution and potential data theft or system manipulation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided at this time. Users should monitor vendor communications for updates and avoid opening annotated PDFs from untrusted sources until a fix is available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-10T19:06:03.365Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a80e09bbf8831d539c1fdf6
Added to database: 08/15/2026, 21:56:43 UTC
Last enriched: 08/23/2026, 13:21:16 UTC
Last updated: 09/30/2026, 03:28:30 UTC
Views: 30
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.