CVE-2026-86157
Exposure of Privileged IPC Functionality in Progress Telerik Fiddler Everywhere
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
5.6
Exposure of Privileged IPC Functionality in Progress Telerik Fiddler Everywhere
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.
- Record
CVE-2026-86157- CVSS 3.1
- 5.6 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N - Weakness
- CWE-749
- Updated
- 2026-11-02
EUVDEUVD-2026-88648
5.6
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.
- Record
EUVD-2026-88648- CVSS 3.1
- 5.6 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-299j-hfrq-4753
5.6
Exposure of privileged IPC functionality in Progress Telerik Fiddler Everywhere before version 8...
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.
- Record
GHSA-299j-hfrq-4753- CVSS 3.1
- 5.6 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N - Weakness
- CWE-749
- Updated
- 2026-11-02
NVD
5.6
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.
- Record
CVE-2026-86157- CVSS 3.1
- 5.6 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N - Weakness
- CWE-749
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-86157 is a medium vulnerability (CVSS 5.6) in Progress Software Progress® Telerik® Fiddler® Everywhere, published September 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.12%, the 1st percentile. No source names a fixed version.
References
telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-exposed-dangerous-method-or-function-cve-2026-86157
nvd.nist.gov/vuln/detail/CVE-2026-86157
telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-exposed-dangerous-method-or-function-cve-2026-86157.
github.com/advisories/GHSA-299j-hfrq-4753