{"uuid": "54f0d6c8-d34f-4190-9ad5-36263028f87e", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-55040", "type": "published-proof-of-concept", "source": "https://t.me/P0x3k_1N73LL1G3NC3/408", "content": "Microsoft SharePoint JWT Token Authentication Bypass (CVE-2026-55040)\n\nA remote unauthenticated attacker can leverage CVE-2026-55040 to bypass authentication on a vulnerable SharePoint server, and perform operations as a SharePoint site user or administrator. The vulnerability is due to several issues in the JWT token validation pipeline.\n\nBlog: https://www.rapid7.com/blog/post/ra-microsoft-sharepoint-jwt-token-authentication-bypass-cve-2026-55040/", "creation_timestamp": "2026-08-11T20:00:04.242611Z"}