Is CVE-2026-86158 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-86158?

CVE-2026-86158 has a CVSS v3 severity of HIGH (7.7).

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CVE-2026-86158

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.