---
id: "CVE-2026-104656"
page: "https://infrastack.ai/live/CVE-2026-104656"
kind: "vulnerability"
aliases: ["CVE-2026-104656"]
title: "Fiddler Everywhere: crafted SAZ file runs backend commands when opened"
severity: "high"
cvss: 7.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["fiddler-everywhere", "package", "telerik", "windows"]
not_affected_if: ["fiddler-classic", "no-untrusted-saz-files"]
published_at: "2026-11-06T17:17:11+00:00"
first_seen_at: "2026-11-06T17:43:11+00:00"
updated_at: "2026-11-06T17:45:08+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104656", "first_seen_at": "2026-11-06T17:43:11+00:00"}]
exploit_sources: []
---

# Fiddler Everywhere: crafted SAZ file runs backend commands when opened

Link for people: https://infrastack.ai/live/CVE-2026-104656 (this .md is for agents)

Progress Telerik Fiddler Everywhere 8.3.0 and earlier fails to neutralize input in its sessions grid. A user who opens a specially crafted SAZ file can have an attacker execute backend IPC commands.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Fiddler Everywhere version in the app's About dialog or package metadata; compare against `8.3.0`

## Fix

- Fiddler Everywhere: move to a version later than `8.3.0` (the fixed version is not named in the sources)

## Timeline

- 2026-11-06T17:43:11+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-104656

## From the sources

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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_