filebrowser File Browser up to 2.63.5 /api/public/share authorization

Summaryinfo

A vulnerability labeled as problematic has been found in filebrowser File Browser up to 2.63.5. The affected element is an unknown function of the file /api/public/share. Such manipulation leads to authorization. This vulnerability is documented as CVE-2026-54091. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in filebrowser File Browser up to 2.63.5. Affected by this issue is an unknown part of the file /api/public/share. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is confidentiality. CVE summarizes:

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.6, File Browser's public share handlers rebase the share owner's filesystem root to the shared directory and then evaluate descendant paths against the owner's global and per-user rules using the rebased relative path instead of the original path relative to the owner's scope. As a result, an attacker who knows a public directory share URL can access files and subdirectories that the owner explicitly blocked with rules, as long as those blocked paths are located underneath the shared directory. In the simplest case this is an unauthenticated information disclosure through `GET /api/public/share/*` and `GET /api/public/dl/*`. This vulnerability is fixed in 2.63.6.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-54091 since 06/11/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 2.63.6 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch e07c59df0b850f5924d5b1683e8609661ddcf534 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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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

License

• open-source

CPE 2.3info

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CPE 2.2info

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