TI-2026-86020 Aliases CVE-2026-104657 GHSA-cwv8-gh9g-g9wh

Missing integrity checks in Progress Fiddler Download & Setup Skill

LOW 34CWE-377Published 2026-11-06 · Updated 2026-11-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: High
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-494.

Summary

Progress Software Fiddler Download & Setup Skill before 8.3.0 on Linux, macOS and Windows does not verify the integrity of a release component it fetches (CWE-494). An attacker who can influence that component can run code of their choice when a user runs the skill, and the attack needs user interaction and is hard to perform. On macOS, a local process can also replace the staged package before the user approves installation, which may allow root code execution.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Missing integrity verification in the Progress Software Fiddler Download and Setup Skill on Linux, macOS, and Windows which allows an attacker to compromise or influence a release component and execute attacker-controlled code when a user runs the skill. On macOS, the skill stages the package at a predictable path and installs it with administrator privileges, which may allow code execution with root privileges after user approval. A local process may also replace the staged macOS package while the skill waits for approval.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00169 6th percentileScored 2026-11-07

Fix Fixed Fiddler Download & Setup Skill (Progress Software): 8.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Progress	Fiddler Download & Setup Skill	before 8.3.0	8.3.0	Patch available	CNA

Fiddler Download & Setup Skill VendorProgress Affected before 8.3.0 Fixed in 8.3.0 Patch available CNA

Remediation

Update Progress Software Fiddler Download & Setup Skill to fixed version 8.3.0.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA Fiddler Download & Setup Skill (Progress Software) Fixed in 8.3.0

Timeline

2026-11-06 Threatist record created from CVE-2026-104657
2026-11-06 CISA SSVC decision points changed
2026-11-06 Priority changed: MEDIUM → LOW
2026-11-06 Alias added: GHSA-cwv8-gh9g-g9wh

References

Advisory 1

https://www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-missing-download-integrity-verification-cve-2026-104657

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See all 436 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences