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SharePoint CVE-2026-55040 PoC is already being used in attacks

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12 hours ago
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SharePoint CVE-2026-55040 PoC is already being used in attacks

Attackers began using Rapid7’s public proof-of-concept exploit for the critical Microsoft SharePoint authentication bypass CVE-2026-55040 within a day of its release. The flaw lets unauthenticated remote attackers forge JWT tokens and impersonate SharePoint users, potentially including administrators. Source

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