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CVEs

CVE-2026-55040

exploited in the wild☆ pin
CVSS
9.1
Reports
14
First seen
Jul 14, 2026
Last seen
Aug 27, 2026
Affected product

Microsoft SharePoint

Associated actors

AndroidKitKat ×1Chinese-nexus APT (vCenter exploitation) ×1Chinese-speaking threat actor (IKE exploitation) ×1Iranian threat actors ×1Lazarus ×1ShinyHunters ×1TA4922 ×1Unknown actors (SharePoint exploitation) ×1

Recent reports

High

ThreatsDay: Weekly threat digest – 296K IoT botnet, water systems targeted, SharePoint RCE, 27+ threats

The Hacker NewsCritical

Hackers target Microsoft SharePoint RCE chain with PoC exploit

Bleeping ComputerCritical

Critical macOS, SharePoint, vCenter, and Microsoft IKE Flaws Under Active Exploitation

The Hacker NewsHigh

CISA Adds Four Known Exploited Vulnerabilities to Catalog

CISA AdvisoriesHigh

Attackers Exploit SharePoint Authentication Bypass Following Public PoC Release

The Hacker NewsHigh

Hackers leverage new Microsoft SharePoint exploit in attacks

Bleeping ComputerCritical

Microsoft Patches 398 Flaws Including Windows Driver Zero-Day Under Active Attack

The Hacker NewsCritical

Researchers Disclose AI-Assisted SharePoint Exploit Chain Reaching Unauthenticated RCE

The Hacker NewsCritical

Critical vulnerabilities in Microsoft SharePoint Server – CVE-2026-56164, CVE-2026-55040, CVE-2026-58644

Canadian Centre AlertsHigh

Microsoft releases record 622 patches in July; two SharePoint and AD flaws exploited in wild

The Record (Recorded Future News)High

Researcher Releases Windows Zero-Day PoC After Microsoft Patch Tuesday; SharePoint Flaws Actively Exploited

The Hacker NewsCritical

CISA warns admins to patch actively exploited SharePoint flaws

Bleeping ComputerHigh

Microsoft Patches Record 622 Flaws in July; Two Zero-Days Under Active Attack

The Hacker NewsCritical

Microsoft July 2026 Patch Tuesday fixes 570 flaws, including 3 zero-days

Bleeping Computer

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