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#SharePoint

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#InSEKurity#CVE#Microsoft#Authentication Bypass#JWT
CVE Research
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
01
CVE Research
sekurity-team

InSEKurity of the Week (CW27/2026): Microsoft SharePoint Server Deserialization RCE (CVE-2026-45659)

A deserialization flaw in Microsoft SharePoint Server lets an authenticated low-privilege user run code on the server -- now added to the CISA KEV catalog under confirmed active exploitation

#InSEKurity#CVE#Microsoft+4
Exploit
02

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