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CVE-2026-55040

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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2026-08-14 / rss-researcherAttackers began exploiting SharePoint CVE-2026-55040 on August 13, hours after a public proof-of-conceptThreat actors started actively exploiting CVE-2026-55040 (CVSS 9.1), a critical SharePoint authentication bypass, on August 13, 2026 after Rapid7 published proof-of-concept code. The flaw lets a remote unauthenticated attacker impersonate any user including an administrator, disclosing files and modifying data; Microsoft patched it in the July 2026 Patch Tuesday. It is the fifth SharePoint vulnerability under active exploitation, and reporting notes a significant portion of the discovery work was performed by an AI agent — a concrete data point on offensive-security automation shortening the patch-to-exploit window.

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MENTIONS
Rapid7
Rapid7 published proof-of-concept code for CVE-2026-55040.
Source finding
MENTIONS
Rapid7 -> CVE-2026-55040
Rapid7 published proof-of-concept code for CVE-2026-55040.
Source finding

Source trail

The Hacker News

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