Vulnerability · Published Jul 15, 2026 · Assigned by GitHub_M
CVE-2026-62685File Browser: Colliding username normalization gives two users the same home directory
High 8.1
In plain English
A high-severity security flaw in filebrowser from filebrowser. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/filebrowser/filebrowser | no fix listed | GO-2026-6024 |
| Go | github.com/filebrowser/filebrowser/v2 | 2.63.17 | GHSA-7rc3-g7h6-22m7 |
| Go | github.com/filebrowser/filebrowser/v2 | 2.63.17 | GO-2026-6024 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| filebrowser | filebrowser | < 2.63.17 |
Weakness: CWE-647, CWE-706 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H