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CVE-2026-77805— Weak Executable Signature Verification Vulnerability in Progress® Telerik® Fiddler® Classic

Quick assessment

Affected
Progress Software Progress® Telerik® Fiddler® Classic
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.

在适用于 Windows 的 In Progress® Telerik® Fiddler® Classic 中，v6.0.20262.10021 之前的版本存在一个完整性检查不充分的问题。当应用程序启动外部辅助工具时，其完整性验证机制仅检查该文件是否具备有效的 Authenticode 签名，且该签名的证书主题名称是否匹配一个宽泛的允许发布商名称片段列表，而未进一步验证该文件是否为该产品特定版本所附带的特定可执行文件。 本地低权限攻击者若将其中一个辅助可执行文件替换为来自已允许发布商的其他有效签名的二进制文件，即可

CVSS 7.9 · High
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I. Basic Information for CVE-2026-77805

Vulnerability Information
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Vulnerability Title
Weak Executable Signature Verification Vulnerability in Progress® Telerik® Fiddler® Classic
Source: CVE Program / CVE List V5
Vulnerability Description
In Progress® Telerik® Fiddler® Classic for Windows, versions prior to v6.0.20262.10021, the integrity check applied to the external helper tools launched by the application is insufficient. Before executing a helper tool, the application only verifies that the file carries a valid Authenticode signature whose certificate subject name matches a broad allow list of publisher name fragments, rather than verifying that the file is the specific executable shipped with that version of the product. A local threat actor with low privileges who replaces one of these helper executables with any other validly signed binary from an allow-listed publisher can cause the substituted binary to be executed by the application, including with Administrator privileges for the tools that request elevation, resulting in privilege escalation and execution of unintended code. Successful exploitation requires the user to launch the affected external tool and to approve the elevation prompt without noticing that it refers to a different executable.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Progress Software Progress® Telerik® Fiddler® Classic 1.0.0 ~ 6.0.20262.10021 -

II. Public POCs for CVE-2026-77805

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III. Intelligence Information for CVE-2026-77805

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Other References for CVE-2026-77805 (1)

Same Patch Batch · Progress Software · 2026-10-05 · 5 CVEs total

CVE-2026-92931 8.8 HIGH CWE-918: Server-Side Request Forgery in the Progress Sitefinity Next.js Renderer SDK
CVE-2026-77804 6.6 MEDIUM Time-of-check Time-of-use (TOCTOU) Race Condition in Root Certificate Installation in Prog
CVE-2026-77802 6.3 MEDIUM HTTP Request Smuggling Vulnerability in Progress® Telerik® Fiddler® Classic
CVE-2026-77803 3.6 LOW Front-end Desynchronization Vulnerability in Progress® Telerik® Fiddler® Classic

IV. Related Vulnerabilities

Same product: Progress® Telerik® Fiddler® Classic
Same vendor: Progress Software
Same weakness: CWE-347

V. Comments for CVE-2026-77805

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