CVE Catalog

CVE-2026-86158

HighCVSS 7.7
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.09%

0th percentile - higher than 0% of all known CVEs

Summary

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.

Risk Assessment

A local attacker can mint OAuth tokens and access the root certificate, potentially enabling network traffic interception.

Recommendation

Update Fiddler Everywhere to a patched version.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS