Attackers exploit SharePoint CVE-2026-55040 after a Rapid7 PoC release, forging JWTs to impersonate site users or admins.

Hackers have already begun using a proof-of-concept (PoC) exploit for a critical Microsoft SharePoint vulnerability, published by cybersecurity company Rapid7 on Tuesday.

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Attackers are exploiting SharePoint flaw CVE-2026-55040 after a public PoC was released, allowing unauthenticated users to impersonate administrators. Attackers started exploiting CVE-2026-55040 (CVSS ...