CVE-2026-62685 File Browser: Colliding username normalization gives two users the same home directory
Attackers can register usernames that normalize to existing users, gaining unauthorized read and write access to another user's files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-62685?
CVE-2026-62685 is a high-severity vulnerability in filebrowser, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.17, File Browser builds new user scopes from usernames passed through cleanUsername() when Signup=true and CreateUserDir=true, but the many-to-one normalization can collapse usernames such as team/one, team one, and team-one to the same home directory without checking whether the resulting scope is already taken, allowing a second registrant to gain full read and write access to another user's files. This issue is fixed in version 2.63.17.
Which versions are affected by CVE-2026-62685?
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 | 2.63.17 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.63.17 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.63.17 |
github.com/filebrowser/filebrowser Go | All versions | None |
How do I fix CVE-2026-62685?
Upgrade github.com/filebrowser/filebrowser/v2 to 2.63.17 or later.
Is CVE-2026-62685 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62685 exists.
Sources
Also known as GHSA-7rc3-g7h6-22m7, GO-2026-6024.