Exposure of Privileged IPC Functionality in Progress Telerik Fiddler Everywhere (CVE-2026-86157) | HOL Guard CVE

Medium · CVSS 5.6CVE-2026-86157

Exposure of Privileged IPC Functionality in Progress Telerik Fiddler Everywhere

Answer in brief

CVE-2026-86157 records a Medium severity (CVSS 5.6) vulnerability in Exposure of Privileged IPC Functionality in Progress Telerik Fiddler Everywhere. The current sources do not mark it as known exploited. The current feed maps Progress Software/Progress® Telerik® Fiddler® Everywhere (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Progress Software/Progress® Telerik® Fiddler® Everywhere (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Progress Software/Progress® Telerik® Fiddler® Everywheregeneric	>=1.0.0 <8.2.0	8.2.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Progress Software/Progress® Telerik® Fiddler® Everywhere.
Review the reported fix. Source-reported workaround: <div>Users should verify that <b>Fiddler Everywhere</b> shortcuts have not been modified with additional command-line arguments, verify the configured browser executable path, and avoid using application-generated authentication links when manual authentication is available.</div>

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Source referencetelerik.com

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.