7.7

CVE-2026-86158: progress software progress® telerik® fiddler® everywhere

CVSS: 7.7v3.1HighAwaiting analysis
Published 29-09-2026Last modified 30-09-2026
Open JSON

Vulnerability summary

CVE-2026-86158 is a high (CVSS 7.7) vulnerability in progress software progress® telerik® fiddler® everywhere. EPSS estimates a 0.09% chance of exploitation in the next 30 days, higher than 0.3% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.7/10
010
High · v3.1 (CVE.org)
EPSS score
0.09%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 29-09-2026
    PublishedVulnerability first disclosed.
  2. 30-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.09%

Chance of exploitation in the next 30 days

Percentile

0%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

29-09-202621-10-2026
EPSS score
0.09%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Progress software1 product

1 vendor · 1 product

References

1 links