filebrowser File Browser up to 2.63.16 User Scope Creation cleanUsername access control

Summaryinfo

A vulnerability was found in filebrowser File Browser up to 2.63.16. It has been declared as critical. The affected element is the function cleanUsername of the component User Scope Creation. The manipulation of the argument Username results in access control. This vulnerability was named CVE-2026-62685. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, was found in filebrowser File Browser up to 2.63.16. Affected is the function cleanUsername of the component User Scope Creation. The manipulation of the argument username with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-62685 since 07/14/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 2.63.17 eliminates this vulnerability.

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Productinfo

Vendor

• filebrowser

Name

• File Browser

Version

• 2.63.0
• 2.63.1
• 2.63.2
• 2.63.3
• 2.63.4
• 2.63.5
• 2.63.6
• 2.63.7
• 2.63.8
• 2.63.9
• 2.63.10
• 2.63.11
• 2.63.12
• 2.63.13
• 2.63.14
• 2.63.15
• 2.63.16

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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