High
Missing Authentication in the local .NET backend of Progress Telerik Fiddler Everywhere
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.
Announced Source revision 1
Original source ↗CVE-2026-86158
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-86158
Progress® Telerik® Fiddler® Everywhere
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Progress Software",
"product": "Progress® Telerik® Fiddler® Everywhere",
"versions": [
{
"status": "affected",
"version": "1.0.0",
"lessThan": "8.2.0",
"versionType": "custom"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-86158
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #4535 · Revision 1
- Added to Heist Feed
- Publisher date