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The IT Nerd
theitnerd.ca
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New SharePoint auth bypass already being exploited hours after PoC went public
Rapid7 published a proof-of-concept exploit today for CVE-2026-55040, an authentication bypass in SharePoint's JWT token validation that lets an attacker impersonate any user or admin without credentials....
https://itnerd.blog/2026/08/12/new-sharepoint-auth-bypass-already-being-exploited-hours-after-poc-went-public/
2026-08-12T16:13:51.472Z