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    CVE-2026-86158

    Missing authentication in the local .NET backend (Fiddler.WebUi) of Progress Software Fiddler Everywhere 8.0.2 allows a local unauthenticated attacker to mint OAuth tokens and read the machine-in-the-middle root certificate through an unauthenticated localhost HTTP and SignalR RPC channel.

    Published:Sep 29, 2026
    Last Modified:Sep 30, 2026
    EPS:Sep 29, 2026
    EPSS Score:0.00087
    CVSS Score:7.7

    Affected Products

    Vendor
    Progress Software
    Product
    Progress Telerik Fiddler Everywhere

    Exploits

    No exploit reference

    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