CVE-2026-86157: Progress Software Progress Telerik Fiddler Everywhere

Medium severity, CVSS 5.6. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Progress Software Progress Telerik Fiddler Everywhere: from 1.0.0, before 8.2.0 (fixed in 8.2.0)

Published 2026-09-29. Last modified 2026-09-30.