Pierluigi Paganini
August 13, 2026
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 score of 9.1), a critical SharePoint authentication bypass patched in July, within days of Rapid7 releasing a public proof-of-concept on August 12. The vulnerability allows an unauthenticated attacker impersonate any SharePoint user […]
