What is CVE-2026-104656?

CVE-2026-104656 is a high-severity vulnerability in Progress Software Progress® Telerik® Fiddler® Everywhere, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2026-11-06.

How severe is CVE-2026-104656?

High severity. CVSS v3 base score is 7.3 out of 10.

XSS in Progress Software Progress® Telerik® Fiddler® Everywhere

CVE-2026-104656

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.

Vulnerability class: XSS (Cross-Site Scripting)

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

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L.

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 Progress® Telerik® Fiddler® Everywhere

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

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

Frequently asked questions

What is CVE-2026-104656?: CVE-2026-104656 is a high-severity vulnerability in Progress Software Progress® Telerik® Fiddler® Everywhere, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2026-11-06.
How severe is CVE-2026-104656?: High severity. CVSS v3 base score is 7.3 out of 10.