CVE-2026-97783 Microsoft CVE debrief

Who should care

Defenders responsible for Microsoft SharePoint Server 2019 deployments should assess exposure and prioritize patching to prevent spoofing attacks.

Why it matters

CVE-2026-97783 is a high-severity spoofing vulnerability in Microsoft Office SharePoint that requires verification and patching to prevent exploitation.

• Verify and apply patches to prevent exploitation
• Monitor systems for suspicious activity related to spoofing attacks
• Review and update inventory to ensure affected systems are identified and prioritized for patching

Technical summary

The vulnerability is due to improper neutralization of input during web page generation, allowing unauthorized attackers to perform spoofing over a network. The affected product is Microsoft SharePoint Server 2019. This vulnerability requires defenders to verify and apply patches from Microsoft, review and update inventory to ensure affected systems are identified and prioritized for patching, and monitor systems for suspicious activity related to spoofing attacks.

Defensive priority

Defenders should prioritize verifying and applying patches from Microsoft, as the vulnerability affects Microsoft SharePoint Server 2019 and allows for spoofing attacks.

Recommended defensive actions

• Verify and apply patches from Microsoft for Microsoft SharePoint Server 2019
• Review and update inventory to ensure affected systems are identified and prioritized for patching
• Monitor systems for suspicious activity related to spoofing attacks

Evidence notes

The CVE record and source item provide details about the vulnerability, its impact, and affected products. However, additional information from official sources may be necessary to fully assess the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.