CVE-2026-86158— Missing Authentication in the local .NET backend of 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.
Progress Software Fiddler Everywhere 8.0.2 的本地 .NET 后端组件（Fiddler.WebUi）存在身份验证缺失漏洞。该漏洞允许本地未认证的攻击者通过未经验证的本地主机 HTTP 及 SignalR RPC 通道，生成 OAuth 令牌并读取中间人（MITM）根证书。
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-86158
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Missing Authentication in the local .NET backend of Progress Telerik Fiddler Everywhere
Source: CVE Program / CVE List V5
Vulnerability Description
Missing authentication in the local .NET backend (Fiddler.WebUi) of Progress Software Fiddler Everywhere 8.0.2 allows a local unauthenticated attacker to mint OAuth tokens and read the machine-in-the-middle root certificate through an unauthenticated localhost HTTP and SignalR RPC channel.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Progress Software | Progress® Telerik® Fiddler® Everywhere | 1.0.0 ~ 8.2.0 | - |
|
II. Public POCs for CVE-2026-86158
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-86158
请登录查看更多情报信息。
Other References for CVE-2026-86158 (1)
IV. Related Vulnerabilities
Same vendor: Progress Software
-
CVE-2026-86157
Exposure of Privileged IPC Functionality in Progress Telerik -
CVE-2026-80462
Privilege Escalation in Progress Chef Automate -
CVE-2026-19219
DialogHandler UploadPaths Tampering Vulnerability in Telerik -
CVE-2026-18672
RadImageEditor ClientState Unauthenticated Arbitrary File Re -
CVE-2026-59690
Progress LoadMaster, ECS Connection Manager, Object Scale Co
Same weakness: CWE-306
V. Comments for CVE-2026-86158
No comments yet