CVE-2026-100639: CVE-2026-100639 - SiYuan v3.8.3 fails to HTML-escape the data-subtype attribute when generating gutter-button markup (app/src/protyle/gutt
SiYuan v3.8.3 fails to HTML-escape the data-subtype attribute when generating gutter-button markup (app/src/protyle/gutter/button.ts, assigned via innerHTML in app/src/protyle/gutt... This is a high threat mapped to CVE-2026-100639; security leaders should validate exposure, prioritize patching, and verify compensat...
Related CVEs
Recommended Defense & Controls
Verified PartnersEnterprise Vulnerability Management & Continuous Scanning
Remediate & Protect →Email, Phishing & Business Email Compromise Defense
Remediate & Protect →Application Security, SAST/DAST & Software Supply Chain
Remediate & Protect →SecOpsPulse may earn an affiliate commission when you procure security software via these partner links. Tool selections are automated based on attack vectors and are independent of editorial coverage.
SecOps Recommended Triage Checklist
- 01.Scope & Asset Discovery: Query vulnerability scanners (e.g. Tenable) and software bill of materials (SBOM) to pinpoint affected packages and services.
- 02.Vendor Patch Application: Prioritize deployment of official security patches released by upstream vendors.
- 03.Compensating Defense Controls: If patch cannot be applied immediately, enforce strict firewall/WAF boundaries and isolate target instances.
- 04.Endpoint Behavioral Monitoring: Audit telemetry via EDR (e.g. CrowdStrike) for abnormal child processes or privilege escalation attempts.
🛠️ SecOps Rapid Incident & Triage Tools for CVE-2026-100639
Integrated Defense ToolchainCalculate CISA BOD 22-01 & SOC 2 patch deadlines for CVE-2026-100639 with 1-click calendar export.
Sanitize exploit payloads, attacker IPs, and C2 URLs linked to CVE-2026-100639 into STIX 2.1 or Snort.
Re-score environmental and temporal CVSS base score vectors for your environment.
Weekly Executive Briefing
Top critical & high-severity threats, every week.
No spam. Unsubscribe anytime. SecOpsPulse may include sponsored security tool recommendations.
Related High-Priority Advisories
CVE-2026-100646 - SiYuan is a self-hosted personal knowledge management system. In versions up to and including 3.8.3, the kernel's authen
CVE-2026-100645 - SiYuan versions 3.7.0 before 3.8.4 contain a stored cross-site scripting vulnerability in gallery and kanban database re
CVE-2026-100644 - SiYuan before v3.8.4 contains a SQL injection vulnerability in the graph query endpoint where the dailyNoteSavePath para