CVE-2026-86157

Medium

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.

SeverityMedium

CVSS5.6

Exploit probability—

ProductProgress® Telerik® Fiddler® Everywhere

PublishedSep 29, 2026

First seenSep 29, 2026

Weakness typeCWE-749CWE-749

How to fix

Update

Progress Software Progress® Telerik® Fiddler® Everywhere8.2.0 or later

Vendor advisories

telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-exposed-dangerous-method-or-function-cve-2026-86157

Affected products

Product	Affected versions	Fixed in
Progress Software Progress® Telerik® Fiddler® Everywhere	1.0.0 ≤ v < 8.2.0	8.2.0

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