CVE-2026-56191

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CVSS 3.1

10.0 critical

EPSS

<1%p53

Published

Jul 24, 2026 (Jul 24, 2026)

Modified

Jul 29, 2026

Description

Improper authentication in Microsoft Exchange Online allows an unauthorized attacker to perform tampering over a network.

Vendors: microsoft
Products: exchange online
Weakness: CWE-287
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.8%)

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