CVE-2026-45659 | Microsoft SharePoint Remote Code Execution Vulnerability | R.A.H.S.I. Framework™
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CVE-2026-45659 | Microsoft SharePoint Remote Code Execution Vulnerability | R.A.H.S.I. Framework™
CVE-2026-45659 exposes SharePoint to authenticated RCE via unsafe deserialization. Patch affected on-prem servers now.
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Microsoft has released security updates for CVE-2026-45659, a high-severity Remote Code Execution vulnerability affecting Microsoft SharePoint Server.
Why this matters
The issue is linked to deserialization of untrusted data, which may allow an authorized attacker to execute code remotely over a network.
Key details
- CVE: CVE-2026-45659
- Impact: Remote Code Execution
- Severity: High
- CVSS: 8.8
- Attack Vector: Network
- Privileges Required: Low
- User Interaction: None
Affected products
- Microsoft SharePoint Server Subscription Edition
- Microsoft SharePoint Server 2019
- Microsoft SharePoint Enterprise Server 2016
R.A.H.S.I. Framework™ Analysis
SharePoint is often central to enterprise collaboration, document workflows, intranet systems, and knowledge repositories.
Even when exploitation requires authentication, the risk remains serious. Compromised credentials, excessive permissions, or exposed on-prem deployments can turn low-privilege access into enterprise exposure.
Recommended actions
- Apply Microsoft security updates
- Prioritize internet-facing SharePoint servers
- Review Site Member permissions
- Monitor authenticated activity
- Validate backups, logging, and incident response readiness
CVE-2026-45659 is a reminder that authenticated vulnerabilities still matter.
The R.A.H.S.I. view is simple:
Patch fast, reduce privilege exposure, monitor authenticated behavior, and treat SharePoint as critical infrastructure.
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