Exposure of Privileged IPC Functionality in Progress Telerik Fiddler Everywhere

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-86157
StatePUBLISHED
AssignerProgressSoftware
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-29 07:16:35 UTC
Updated2026-09-30 16:19:21 UTC
DescriptionExposure 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.

Risk And Classification

Primary CVSS: v3.1 5.6 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

EPSS: 0.001190000 probability, percentile 0.016000000 (date 2026-09-29)

Problem Types: CWE-749 | CWE-749 CWE-749 Exposed Dangerous Method or Function

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.6MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
3.1CNACVSS5.6MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Progress Software Progress Telerik Fiddler Everywhere affected 1.0.0 8.2.0 custom Not specified

References

ReferenceSourceLinkTags
www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-se... [email protected] www.telerik.com
www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-se... MITRE www.telerik.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Ezinne Kalu (github.com/zikk090) (en)

Additional Advisory Data

Workarounds

CNA: Users should verify that Fiddler Everywhere shortcuts have not been modified with additional command-line arguments, verify the configured browser executable path, and avoid using application-generated authentication links when manual authentication is available.

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