CVE-2026-86158

LOWCVSS 7.7 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.0/ 10 priority

Sources & remediation

Other references

https://www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-missing-authentication-for-critical-function-cve-2026-86158

Weakness type (CWE)

CWE-306

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Referenced assets1 URL

By indicator

https://www.cve.org/CVERecord?id=CVE-2026-86158

Full discourse1 post

🐣@Thezinnekalu1d
Two of the vulnerabilities I found in Progress software have been assigned CVEs. Let's go🚀 https://www.cve.org/CVERecord?id=CVE-2026-86158 https://www.cve.org/CVERecord?id=CVE-2026-86158
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