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Researchers Disclose AI-Assisted SharePoint Exploit Chain Reaching Unauthenticated RCE

·Source: The Hacker News

Updated:

Executive Summary

Security researchers found a way to enter Microsoft SharePoint servers as any user, including an administrator, with no valid account. A significant part of the work that found it was done through an AI agent. The flaw, tracked as CVE-2026-55040 (CVSS 9.1), affects SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Server 2016. Microsoft's

Analysis

Security researchers found a way to enter Microsoft SharePoint servers as any user, including an administrator, with no valid account. A significant part of the work that found it was done through an AI agent. The flaw, tracked as CVE-2026-55040 (CVSS 9.1), affects SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Server 2016. Microsoft's

Indicators of Compromise (1)

CVE (1)
CVE-2026-55040
NVDMITRE CVE
Source Attribution

Originally published by The Hacker News on Aug 11, 2026.

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