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.
History

Wed, 30 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 30 Sep 2026 15:30:00 +0000


Wed, 30 Sep 2026 14:30:00 +0000


Tue, 29 Sep 2026 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Progress Software
Progress Software progress Telerik Fiddler Everywhere
Vendors & Products Progress Software
Progress Software progress Telerik Fiddler Everywhere

Tue, 29 Sep 2026 06:45:00 +0000

Type Values Removed Values Added
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.
Title Missing Authentication in the local .NET backend of Progress Telerik Fiddler Everywhere
Weaknesses CWE-306
References
Metrics cvssV3_1

{'score': 7.7, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: ProgressSoftware

Published: 2026-09-29T06:34:24.264Z

Updated: 2026-09-30T15:28:20.211Z

Reserved: 2026-09-05T09:09:33.404Z

Link: CVE-2026-86158

cve-icon Vulnrichment

Updated: 2026-09-30T15:27:26.474Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-29T07:16:35.520

Modified: 2026-09-30T16:19:21.907

Link: CVE-2026-86158

cve-icon Redhat

No data.