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#InSEKurity #CVE #Microsoft #SharePoint #Authentication Bypass

CVE Research

Aug 25, 2026

sekurity-team

InSEKurity of the Week (CW34/2026): Microsoft SharePoint JWT Authentication Bypass (CVE-2026-55040)

Four separate failures in SharePoint's JWT validation pipeline let an unauthenticated attacker forge a token for any user -- including a site administrator -- and CISA added it to the KEV catalog on August 18 after exploitation followed the public PoC within a day.

#InSEKurity #CVE #Microsoft+4

Exploit

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