High [CVE-2026-45659] Microsoft SharePoint Remote Code Execution Vulnerability
This high-severity Microsoft Server advisory covers CVE-2026-45659 affecting Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.
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Summary
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Affected products named by the advisory: Microsoft SharePoint Enterprise Server 2016; Microsoft SharePoint Server 2019; Microsoft SharePoint Server Subscription Edition.
CISA Known Exploited Vulnerability
- Listed:
- Jul 1, 2026 · federal remediation due Jul 4, 2026
- Required action:
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- Ransomware use:
- Known
KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.
- Microsoft SharePoint Enterprise Server 2016 16.0.0 before 16.0.5552.1002
- Microsoft SharePoint Server 2019 16.0.0 before 16.0.10417.20128
- Microsoft SharePoint Server Subscription Edition 16.0.0 before 16.0.19725.20280
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 16.0.5552.1002
- 16.0.10417.20128
- 16.0.19725.20280
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 16.0.5552.1002, 16.0.10417.20128, 16.0.19725.20280. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Discussion(0)
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