CVE-2026-86158
Missing Authentication in the local .NET backend of Progress Telerik Fiddler Everywhere
CVSS Score
7.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-306 |
| Vendor | progress software |
| Product | progress® telerik® fiddler® everywhere |
| Published | Sep 29, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Progress Software / Progress® Telerik® Fiddler® Everywhere
1.0.0 < 8.2.0
References
Credits
whizarre