What is CVE-2026-104657?

CVE-2026-104657 is a high-severity vulnerability in Progress Software Fiddler Download & Setup Skill, classified under Insecure Temporary File. CVSS score: 7.5/10. Published 2026-11-06.

How severe is CVE-2026-104657?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Progress Software Fiddler Download & Setup Skill

CVE-2026-104657

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.

Published 2026-11-06 · last modified 2026-11-06.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Progress Software Fiddler Download & Setup Skill

Weakness classification (CWE)

References

www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-secu… (vendor-advisory)

Frequently asked questions

What is CVE-2026-104657?: CVE-2026-104657 is a high-severity vulnerability in Progress Software Fiddler Download & Setup Skill, classified under Insecure Temporary File. CVSS score: 7.5/10. Published 2026-11-06.
How severe is CVE-2026-104657?: High severity. CVSS v3 base score is 7.5 out of 10.