CVE-2026-104656— Cross-site Scripting in Progress Telerik Fiddler Everywhere

Quick assessment

Affected

Progress Software Progress® Telerik® Fiddler® Everywhere

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Progress Telerik Fiddler Everywhere 8.3.0 及更早版本中，会话网格（sessions grid）未能正确净化输入数据，攻击者可通过诱使用户打开特制的 SAZ 文件，执行后端 IPC（进程间通信）命令。

CVSS 7.3 · High Updated Nov 07, 2026

Possible ATT&CK Techniques 2 AI

T1566 · Phishing T1203 · Exploitation for Client Execution

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Vulnerability Information

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Vulnerability Title

Cross-site Scripting in Progress Telerik Fiddler Everywhere

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

Source: CVE Program / CVE List V5

Vulnerability Type

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Progress Software	Progress® Telerik® Fiddler® Everywhere	0 ~ 8.3.0	-

II. Public POCs for CVE-2026-104656

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-104656

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Other References for CVE-2026-104656 (1)

https://www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-cross-site-scripting-cve-2026-104656 vendor-advisory

https://www.cve.org/CVERecord?id=CVE-2026-104656

Same Patch Batch · Progress Software · 2026-11-06 · 11 CVEs total

CVE-2026-104657	7.5 HIGH	Missing Integrity Verification in Progress Software Fiddler Download & Setup Skill
CVE-2026-106135	5.4 MEDIUM	Cross-Site Scripting in Progress Software Kendo UI for Angular
CVE-2026-106134	5.4 MEDIUM	Cross-Site Scripting in Progress Software KendoReact
CVE-2026-106143	5.4 MEDIUM	Cross-Site Scripting in Progress Software Kendo UI for Vue
CVE-2026-106136	5.4 MEDIUM	Cross-Site Scripting in Progress Software KendoReact
CVE-2026-106142	5.4 MEDIUM	Cross-Site Scripting in Progress Software KendoReact
CVE-2026-106141	5.4 MEDIUM	Cross-Site Scripting in Progress Software Kendo UI for Angular
CVE-2026-106128	4.1 MEDIUM	Prototype Pollution in Progress Software Kendo UI for Vue
CVE-2026-106144	4.1 MEDIUM	Prototype Pollution in Progress Software Kendo UI for Angular
CVE-2026-106127	4.1 MEDIUM	Prototype Pollution in Progress Software KendoReact

IV. Related Vulnerabilities

Same product: Progress® Telerik® Fiddler® Everywhere

Same vendor: Progress Software

Same weakness: CWE-79