CVE-2026-86157 Exposure of Privileged IPC Functionality in Progress Telerik Fiddler Everywhere
Local attackers can exploit exposed IPC functions to steal OAuth tokens and execute code by modifying application launch parameters.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-86157?
CVE-2026-86157 is a medium-severity missing authorization vulnerability in Progress® Telerik® Fiddler® Everywhere, published on 29 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-749
Which versions are affected by CVE-2026-86157?
How do I fix CVE-2026-86157?
No fix has been published for CVE-2026-86157 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-86157 being exploited?
There is no known exploitation of CVE-2026-86157 in the wild and no public exploit code.
Sources
Also known as GHSA-299j-hfrq-4753.