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    CVE-2026-56191

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

    Published:Jul 24, 2026
    Last Modified:Jul 24, 2026
    EPS:Jul 24, 2026
    EPSS Score:0.00681
    CVSS Score:10

    Affected Products

    Vendor
    Microsoft
    Product
    Exchange Online

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High