---
id: CVE-2026-104656
title: Cross-site Scripting in Progress Telerik Fiddler Everywhere
summary: >-
  Improper neutralization of input in the sessions grid in Progress Telerik
  Fiddler Everywhere 8.3.0 and earlier allows an attacker to execute backend IPC
  commands by convincing a user to open a specially crafted SAZ file.
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L'
cvssSource: cna
cwe:
  - CWE-79
vendor: Progress Software
product: Progress® Telerik® Fiddler® Everywhere
affected:
  - progress_telerik_fiddler_everywhere < 8.3.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-06T17:15:42.571809Z'
published: '2026-11-06'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:47:32.742Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-104656'
references:
  - url: >-
      https://www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-cross-site-scripting-cve-2026-104656
tags:
  - cve.org
ingestedAt: '2026-11-06T16:57:43.206Z'
epss: 0.00168
epssPercentile: 0.06135
---

## Overview

Improper neutralization of input in the sessions grid in Progress Telerik Fiddler Everywhere 8.3.0 and earlier allows an attacker to execute backend IPC commands by convincing a user to open a specially crafted SAZ file.

## Affected

- `progress_telerik_fiddler_everywhere < 8.3.0`

## Remediation

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

### Workarounds

Do not open SAZ files from untrusted sources.