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Attackers Exploit SharePoint Authentication Bypass After Public PoC Release

medthehackernewsPublished 2026-08-13

Threat actors have begun to exploit a newly disclosed Microsoft SharePoint vulnerability following the release of a proof-of-concept (PoC) code.

The vulnerability in question is CVE-2026-55040 (CVSS score: 9.1), which refers to a critical security feature bypass that stems from weak authentication. It was patched by Microsoft as part of its July 2026 Patch Tuesday updates.

"The authentication

MITRE ATT&CK techniques

SharepointT1213.002

Indicators of compromise

CVE-2026-55040cve

Original source: https://thehackernews.com/2026/08/attackers-exploit-sharepoint.html