CVE-2026-86158

7.7 highEPSS 0.09%

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.

CVSS 3.1: 7.7CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS: 0.09% chance of exploitation in the next 30 days; higher than 0% of CVEs (scores of 2026-10-25)
CWE: CWE-306
Published: 2026-09-29
Modified: 2026-09-30
Record from: the NVD, synced 2026-10-19

References

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

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