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Vulnerabilities

CVE-2026-23850

High ⚡ Exploit Available
SiYuan is a personal knowledge management system. In versions prior to 3.5.4, the markdown feature allows unrestricted server side html-rendering which allows arbitrary file read (LFD). Version 3.5.4
CWE-22 — Weakness Type
Published: Jan 19, 2026  ·  Modified: Feb 28, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

SiYuan is a personal knowledge management system. In versions prior to 3.5.4, the markdown feature allows unrestricted server side html-rendering which allows arbitrary file read (LFD). Version 3.5.4 fixes the issue.

🤖 AI Executive Summary

SiYuan knowledge management system versions before 3.5.4 contain a local file disclosure vulnerability through unrestricted HTML rendering in markdown features. Attackers can read arbitrary files from the server by exploiting improper sanitization of markdown content.

📄 Description (Arabic)

يسمح نظام SiYuan بعرض HTML غير مقيد في ميزات markdown مما يؤدي إلى ثغرة كشف الملفات المحلية. يمكن للمهاجمون استخدام هذه الثغرة للوصول إلى ملفات حساسة على الخادم دون تصريح. تم إصلاح هذه المشكلة في الإصدار 3.5.4.

🤖 ملخص تنفيذي (AI)

نظام إدارة المعرفة SiYuan في الإصدارات السابقة للإصدار 3.5.4 يحتوي على ثغرة في الكشف عن الملفات المحلية من خلال عرض HTML غير مقيد في ميزات markdown. يمكن للمهاجمين قراءة ملفات عشوائية من الخادم عن طريق استغلال عدم التحقق الصحيح من محتوى markdown.

🤖 AI Intelligence Analysis Analyzed: May 4, 2026 07:49
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: medium
🏢 Affected Saudi Sectors
government healthcare
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
7.0
/ 10.0
🔧 Remediation Steps (English)
Upgrade SiYuan to version 3.5.4 or later immediately. Implement input validation and HTML sanitization for all markdown rendering. Apply web application firewall rules to restrict file access patterns. Review and restrict file system permissions for the application process.
🔧 خطوات المعالجة (العربية)
قم بترقية SiYuan إلى الإصدار 3.5.4 أو أحدث فوراً. قم بتطبيق التحقق من المدخلات وتنظيف HTML لجميع عمليات عرض markdown. طبق قواعد جدار الحماية لتطبيقات الويب لتقييد أنماط الوصول إلى الملفات. راجع وقيد أذونات نظام الملفات لعملية التطبيق.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.8.2.1 A.8.2.2
🔵 SAMA CSF
ID.RA-1 PR.DS-1
🟡 ISO 27001:2022
A.14.2.1 A.14.2.5
📦 Affected Products / CPE 1 entries
b3log:siyuan
📊 CVSS Score
7.5
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityN — None / Network
AvailabilityN — None / Network
📋 Quick Facts
Severity High
CVSS Score7.5
CWECWE-22
EPSS0.06%
Exploit ✓ Yes
Patch ✓ Yes
Published 2026-01-19
Source Feed nvd
Views 5
🇸🇦 Saudi Risk Score
7.0
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
exploit-available patch-available CWE-22
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