CVE-2026-86158

HighCVSS 7.7/10Last modified Sep 30, 2026

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.

Metrics

CVSS 3.1 7.7/10CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-306

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Progress Software	Progress® Telerik® Fiddler® Everywhere	>= 1.0.0, < 8.2.0

References

https://www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-missing-authentication-for-critical-function-cve-2026-86158

Timeline

Published: Sep 29, 2026
Last modified: Sep 30, 2026
NVD status: Awaiting Analysis

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