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    CVE-2026-40372

    Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.

    Published:Apr 21, 2026
    Last Modified:Apr 28, 2026
    EPS:Apr 21, 2026
    EPSS Score:0.00025
    CVSS Score:9.1

    Affected Products

    Vendor
    Microsoft
    Product
    Asp.net Core
    Vendor
    Microsoft
    Product
    Visual Studio 2026

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

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    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