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Rapid7 Analysis: Microsoft SharePoint JWT Token Authentication Bypass (CVE-2026-55040)

medrapid7Published 2026-08-11

<h2 style="direction: ltr;">Overview</h2><p style="direction: ltr;"><span style="font-size: undefined;">On July 14, 2026, Rapid7 and Microsoft </span><a href="/blog/post/ve-cve-2026-55040-microsoft-sharepoint-jwt-token-authentication-bypass-fixed/" target="_self"><span style="font-size: undefined;">disclosed</span></a><span style="font-size: undefined;"> CVE-2026-55040, an authentication bypass vu

MITRE ATT&CK techniques

Indicators of compromise

Original source: https://www.rapid7.com/blog/post/ra-microsoft-sharepoint-jwt-token-authentication-bypass-cve-2026-55040