gtsteffaniak FileBrowser up to 1.3.2 Password Comparison /api/auth/login bcrypt Username comparison

Summaryinfo

A vulnerability has been found in gtsteffaniak FileBrowser up to 1.3.2 and classified as problematic. Affected is the function bcrypt of the file /api/auth/login of the component Password Comparison. The manipulation of the argument Username leads to comparison. This vulnerability is documented as CVE-2026-54685. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in gtsteffaniak FileBrowser up to 1.3.2. This issue affects the function bcrypt of the file /api/auth/login of the component Password Comparison. The manipulation of the argument username with an unknown input leads to a comparison vulnerability. Using CWE to declare the problem leads to CWE-697. The product compares two entities in a security-relevant context, but the comparison is incorrect, which may lead to resultant weaknesses. Impacted is confidentiality. The summary by CVE is:

FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to version 1.3.2-beta, the `/api/auth/login` authentication endpoint does not execute in constant time. When a non-existent username is supplied, the server returns a `401`/`403` response almost immediately. When a valid username is provided, the server performs a bcrypt password comparison, causing a measurable delay in the response time. Version 1.3.2-beta patches the issue.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-54685 since 06/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 1.3.2 eliminates this vulnerability.

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Productinfo

Vendor

• gtsteffaniak

Name

• FileBrowser

Version

• 1.3.0
• 1.3.1
• 1.3.2

Website

• Product: https://github.com/gtsteffaniak/filebrowser/

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