Exposure of Privileged IPC Functionality in Progress Telerik Fiddler Everywhere

published 2026-09-29 41 d ago modified 2026-09-30 39 d ago also EUVD-2026-88648

cvss: 5.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits: 0; none known

Exposure of privileged IPC functionality in Progress Telerik Fiddler Everywhere before version 8.2.0 allows a local, low-privileged attacker who can modify application launch parameters and persuade a user to start the application to replace the application UI or settings with attacker-controlled content. Successful exploitation could result in disclosure of OAuth authentication tokens, execution of locally accessible programs, or unauthorized modification of application-generated configuration files.

Patch / fix

fixed in 1

Progress Software Progress® Telerik® Fiddler® Everywhere 8.2.0

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 39 d ago (2026-09-30)

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.6	CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

Affected products

Progress Software Progress® Telerik® Fiddler® Everywhere

Classification

Weakness

CWE-749 Exposed Dangerous Method or Function

References

telerik.com /fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-exposed-dangerous-method-or-function-cve-
vendor-advisory

Sources

CVE List CVE-2026-86157
NVD CVE-2026-86157

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary