Consultant-Style Cybersecurity Report
Professional vulnerability assessment report for SharePoint deserialization risk, including executive summary, technical impact, remediation, and mitigation strategy.
| Field | Details |
|---|---|
| Report Type | Vulnerability Assessment Report |
| Engagement Context | Security Research |
| Primary Focus | Enterprise Collaboration Security |
| Audience | Security teams, engineering teams, hiring managers |
| Output Style | Executive summary, technical analysis, business impact, remediation roadmap |
| Publication State | Sanitized for public portfolio review |
Important
This report is intentionally sanitized for public GitHub publication. Sensitive identifiers, credentials, infrastructure values, and client-specific evidence are replaced with clear placeholders.
Tip
For a fast review, start with the Executive Summary and Impact sections. For technical depth, continue into Technical Analysis and Remediation.
CVE-2026-45659 - Microsoft SharePoint Deserialization RCE
ثغرة أمنية في Microsoft SharePoint Server 2019/2022 و Subscription Edition تسمح لمستخدم مُصادق بصلاحيات منخفضة (Site Member) بتنفيذ أوامر عشوائية على الخادم (RCE). تستغل الثغرة آلية إلغاء التسلسل غير الآمنة (Unsafe Deserialization) في معالج LosFormatter.Deserialize داخل مكتبة Microsoft.SharePoint.Library.
| Attribute | Value |
|---|---|
| Identifier | CVE-2026-45659 |
| CVSS / Severity | 8.8 |
| Weakness Class | CWE-502 (Deserialization of Untrusted Data) |
| Affected Scope | المنتج |
The weakness was assessed from an application-security and infrastructure-risk perspective. The core issue is classified as Remote Code Execution and was documented in a sanitized form suitable for public portfolio publication.
| العنصر | التفاصيل |
|---|---|
| CVE | CVE-2026-45659 |
| CVSS | 8.8 (High) |
| النوع | Deserialization RCE |
| المعيار | CWE-502 (Deserialization of Untrusted Data) |
| الصلاحية المطلوبة | Site Member (مستخدم عادي) |
| المنتج | Microsoft SharePoint Server |
- Unauthorized command execution within the affected application context.
- Potential service takeover, data exposure, and lateral movement depending on deployment privileges.
- تطبيق تحديث مايو 2026 من Microsoft
- تقييد صلاحيات المستخدمين إلى الحد الأدنى
- مراقبة استدعاءات SPListItem.Update() غير الطبيعية
- تفعيل Advanced Threat Protection في SharePoint
- Treat every integration boundary as untrusted, especially when application logic forwards user-controlled values to filesystems, shells, parsers, or external tools.
- Security reviews should validate the complete exploit chain, not only the first vulnerable endpoint; low-severity misconfigurations can become critical when chained.
- Public-facing documentation should describe risk, root cause, and remediation without exposing operational identifiers, credentials, or reusable exploitation artifacts.
- Defensive controls should combine preventive validation, runtime least privilege, telemetry, and patch governance to reduce both exploitability and blast radius.
- Sensitive infrastructure identifiers, IP addresses, hostnames, credentials, hashes, and e-mail addresses were replaced with explicit placeholders.
- Reusable operational evidence was minimized or abstracted to keep the document suitable for public GitHub publication.
- The document uses a consultant-style structure aligned with common web security testing report practices such as OWASP WSTG reporting expectations.
Prepared as a professional cybersecurity portfolio report
Focused on clear risk communication, practical remediation, and defensive improvement.