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TI-2026-58947 Aliases CVE-2026-86158GHSA-rx77-7xhh-crpr

Missing Authentication in the local .NET backend of Progress Telerik Fiddler Everywhere

Priority LOW 34CWE-306Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-306.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00087 0th percentileScored 2026-11-07
Fix Fixed Progress® Telerik® Fiddler® Everywhere (Progress Software): 8.2.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ProgressProgress® Telerik® Fiddler® Everywhere1.0.0 to before 8.2.08.2.0Patch availableCNA
  • Progress® Telerik® Fiddler® Everywhere VendorProgress Affected 1.0.0 to before 8.2.0 Fixed in 8.2.0 Patch available CNA

Remediation

  • Fix · CNA Progress® Telerik® Fiddler® Everywhere (Progress Software) Fixed in 8.2.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Progress® Telerik® Fiddler® Everywhere 8.2.0

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-58946 Exposure of Privileged IPC Functionality in Progress Telerik Fiddler EverywherePriority LOW 24
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86158
  2. 2026-10-03 Alias added: GHSA-rx77-7xhh-crpr

References

Advisory 1

  • TI-2026-07083 Command injection in Progress LoadMaster KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-06182 WhatsUp Gold HasErrors SQL Injection Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-04541 WhatsUp Gold GetFileWithoutZip Directory Traversal Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-04060 Registration Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-01127 LoadMaster Pre-Authenticated OS Command Injection KEVCVSS 3.1CRITICAL 10.0
  • TI-2023-20934 WS_FTP Server Ad Hoc Transfer Module .NET Deserialization Vulnerability KEVCVSS 3.1CRITICAL 10.0
See all 436 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences