---
id: CVE-2026-86157
title: >-
  Exposure of privileged IPC functionality in Progress Telerik Fiddler
  Everywhere before version 8.2.0 allows a local, low-privileged attacker who
  can modify application launch parameters and persuade a user to start the
  application to rep…
summary: >-
  Exposure of privileged IPC functionality in Progress Telerik Fiddler
  Everywhere before version 8.2.0 allows a local, low-privileged attacker who
  can modify application launch parameters and persuade a user to start the
  application to rep…
severity: medium
cvss: 5.6
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N'
cwe:
  - CWE-749
vendor: Progress Software
product: Progress® Telerik® Fiddler® Everywhere
affected:
  - progress_telerik_fiddler_everywhere >= 1.0.0 < 8.2.0
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T07:16:35.377'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86157'
references:
  - url: >-
      https://www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-exposed-dangerous-method-or-function-cve-2026-86157.
    label: security@progress.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-29T07:29:26.132Z'
---

## Overview

Exposure of privileged IPC functionality in Progress Telerik Fiddler Everywhere before version 8.2.0 allows a local, low-privileged attacker who can modify application launch parameters and persuade a user to start the application to replace the application UI or settings with attacker-controlled content. Successful exploitation could result in disclosure of OAuth authentication tokens, execution of locally accessible programs, or unauthorized modification of application-generated configuration files.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.