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OpenAdvisories
High · 7.7 CVE-2026-86158 EUVD-2026-88649GHSA-rx77-7xhh-crpr

Missing Authentication in the local .NET backend of Progress Telerik Fiddler Everywhere

Published Sep 29, 2026 · Updated Sep 30, 2026 · Assigned by ProgressSoftware

Description

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.

Affected products

VendorProductAffectedFixed
Progress Software Progress® Telerik® Fiddler® Everywhere 1.0.0 – < 8.2.0 8.2.0

References