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CVE-2026-55040: SharePoint RCE Chain Found via AI Agent

CVE-2026-55040: SharePoint RCE Chain Found via AI Agent

ATLAS OWASP CRITICAL Active exploitation · Immediate action required ▲ 7.2 The Hacker News

Rapid7 researchers disclosed a critical unauthenticated RCE exploit chain against Microsoft SharePoint on-premises editions, chaining CVE-2026-55040 (CVSS 9.1) with CVE-2026-63520 (CVSS 8.1). Notably, an AI agent played a significant role in discovering the two-vulnerability path across 24 active research days, though human expert oversight was required to correct model errors and prevent the agent from overstepping its operational boundaries. The disclosure highlights both the offensive utility and current limitations of agentic AI in vulnerability research.

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