CVE-2026-55040

LLM-synthesized narrative grounded in this CVE's description and references.

• Microsoft/Sharepoint Server3 versions

  cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*+ 2 more

  • cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*range: <16.0.19725.20434
  • cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*
• Microsoft/Office SharePointllm-fuzzy

• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55040nvdPatchVendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalognvdExploitThird Party Advisory
• www.rapid7.com/blog/post/ra-microsoft-sharepoint-jwt-token-authentication-bypass-cve-2026-55040/nvdUS Government Resource

• ThreatsDay: 296K IoT Botnet, 100+ Water Systems Targeted, SharePoint RCE Chain + 27 New Stories
  The Hacker News · Aug 27, 2026
• Two Microsoft SharePoint Flaws Can Be Chained to Hack Servers Without a Password
  Cyber Security News · Aug 26, 2026
• Rapid7 Analysis: Microsoft SharePoint Remote Code Execution (CVE-2026-63520)
  Rapid7 Blog · Aug 24, 2026
• CISA Adds Microsoft SharePoint Weak Authentication Vulnerability to KEV List
  Cyber Security News · Aug 19, 2026
• Critical macOS, SharePoint, vCenter, and Microsoft IKE Flaws Under Active Exploitation
  The Hacker News · Aug 19, 2026
• CISA Urges Immediate Patching of Exploited Microsoft, VMware, Apple Vulnerabilities
  SecurityWeek · Aug 19, 2026
• Microsoft: 2 Actively-Exploited Flaws Added to CISA KEV
  Vypr Intelligence · Aug 18, 2026
• Week in review: Salesforce and ServiceNow portals exposed for 17 months, exploited Metabase 0-day
  Help Net Security · Aug 16, 2026
• Attackers exploit critical SharePoint flaw after PoC goes public (CVE-2026-55040)
  Help Net Security · Aug 13, 2026
• Hackers Actively Exploiting Microsoft SharePoint Vulnerability Following PoC Release
  Cyber Security News · Aug 13, 2026
• Attackers Exploit SharePoint Authentication Bypass After Public PoC Release
  The Hacker News · Aug 13, 2026
• SharePoint Vulnerability Exploited Shortly After PoC Release
  SecurityWeek · Aug 12, 2026
• Microsoft patches 400+ vulnerabilities, one zero-day under attack (CVE-2026-68820)
  Help Net Security · Aug 12, 2026
• Microsoft SharePoint Server Vulnerability Allows Attackers to Inject and Execute Malicious Code Remotely
  Cyber Security News · Aug 12, 2026
• Patch Tuesday - August 2026
  Rapid7 Blog · Aug 11, 2026
• Microsoft Patches 398 Flaws Including a Windows Driver Zero-Day Under Active Attack
  The Hacker News · Aug 11, 2026
• Researchers Disclose AI-Assisted SharePoint Exploit Chain Reaching Unauthenticated RCE
  The Hacker News · Aug 11, 2026
• CVE-2026-63520: Microsoft SharePoint Remote Code Execution (FIXED)
  Rapid7 Blog · Aug 11, 2026
• Rapid7 Analysis: Microsoft SharePoint JWT Token Authentication Bypass (CVE-2026-55040)
  Rapid7 Blog · Aug 11, 2026
• CISA Adds Four Known Exploited Vulnerabilities to Catalog
  CISA Alerts