CVE-2026-55668 File Browser: ScopedFs follows a dangling symlink on write, letting a scoped user create files outside their scope
An authenticated user can create files outside their assigned scope by exploiting dangling symlink validation in File Browser.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55668?
CVE-2026-55668 is a medium-severity path traversal vulnerability in filebrowser, published on 8 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
File Browser provides a web file managing interface. Prior to 2.63.16, ScopedFs validates the nearest existing ancestor of a dangling symlink as in scope and then follows the symlink during file creation, allowing an authenticated user with Create and Modify permissions to create attacker-controlled files outside the user's scope. This issue is fixed in version 2.63.16.
Which versions are affected by CVE-2026-55668?
4 open source packages ship an affected version, including github.com/filebrowser/filebrowser/v2 and github.com/filebrowser/filebrowser.
| Package | Affected | Fixed in |
|---|---|---|
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.63.16 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.63.16 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.63.16 |
github.com/filebrowser/filebrowser Go | All versions | None |
How do I fix CVE-2026-55668?
Upgrade github.com/filebrowser/filebrowser/v2 to 2.63.16 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-55668 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55668 exists.
Sources
Also known as GHSA-8wc8-hf36-mjh9, GO-2026-6020.