importantSYS.SOURCE: The Hacker News• 2026-08-11T22:17:44+05:30

AI-Assisted Exploit Chain Enables Unauthenticated RCE in SharePoint Servers

#ai #vulnerability #rce #sharepoint #enterprise security

Researchers discovered an AI-assisted exploit chain in SharePoint that allows unauthenticated remote code execution (RCE) by leveraging two vulnerabilities, CVE-2026-55040 and CVE-2026-63520, affecting multiple on-premises editions. The exploit requires knowledge of a target user's SID or UPN and chains a JWT validation bypass with a .NET type instantiation flaw, prompting urgent patching for affected systems.

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

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> TESLA RECALLS 2.98 MILLION VEHICLES IN CHINA DUE TO HIDDEN DOOR HANDLE SAFETY CONCERNS > UNEXPECTED IMPLICATIONS OF KPIS IN ORGANIZATIONAL PERFORMANCE METRICS > BEN MCKENZIE CONDEMNS CRYPTOCURRENCY AS LARGEST PONZI SCHEME IN HISTORY > MIGRATING SYNOLOGY NAS TO UNIFI UNAS PRO 8 USING ROBOCOPY AND SMB MULTICHANNEL: PERFORMANCE INSIGHTS > SHODAN: A SEARCH ENGINE FOR INTERNET-CONNECTED DEVICES > DEVELOPMENT OF A LOW-LATENCY AI GAMING COMPANION FOR SKYRIM > REVERSE ENGINEERING PERIPHERALS: FIRMWARE ANALYSIS AND SECURITY EXPLOITS > EFFICIENT PARALLEL DEVELOPMENT WITH GIT WORKTREE TO AVOID CONTEXT SWITCHING > GPT-2 MODEL IMPLEMENTATION USING PURE CMAKE > DECLARATIVE WEBGPU CONFIGURATION USING S-EXPRESSIONS> TESLA RECALLS 2.98 MILLION VEHICLES IN CHINA DUE TO HIDDEN DOOR HANDLE SAFETY CONCERNS > UNEXPECTED IMPLICATIONS OF KPIS IN ORGANIZATIONAL PERFORMANCE METRICS > BEN MCKENZIE CONDEMNS CRYPTOCURRENCY AS LARGEST PONZI SCHEME IN HISTORY > MIGRATING SYNOLOGY NAS TO UNIFI UNAS PRO 8 USING ROBOCOPY AND SMB MULTICHANNEL: PERFORMANCE INSIGHTS > SHODAN: A SEARCH ENGINE FOR INTERNET-CONNECTED DEVICES > DEVELOPMENT OF A LOW-LATENCY AI GAMING COMPANION FOR SKYRIM > REVERSE ENGINEERING PERIPHERALS: FIRMWARE ANALYSIS AND SECURITY EXPLOITS > EFFICIENT PARALLEL DEVELOPMENT WITH GIT WORKTREE TO AVOID CONTEXT SWITCHING > GPT-2 MODEL IMPLEMENTATION USING PURE CMAKE > DECLARATIVE WEBGPU CONFIGURATION USING S-EXPRESSIONS