filebrowser File Browser 2.0.0-rc.1 improper authentication

Summaryinfo

A vulnerability was found in filebrowser File Browser 2.0.0-rc.1 and classified as critical. Affected by this vulnerability is an unknown functionality. Such manipulation leads to improper authentication. This vulnerability is referenced as CVE-2026-54089. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in filebrowser File Browser 2.0.0-rc.1 and classified as critical. Affected by this issue is an unknown code. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is 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. Starting with 2.0.0-rc.1, when FileBrowser is configured with proxy authentication (auth.method=proxy), any unauthenticated attacker who can reach the server directly can impersonate any user - including admin - by sending a single forged HTTP header. No credentials are required. Additionally, specifying a non-existent username causes the server to automatically create a new user account, providing an account creation primitive with no authorization. This is an already known issue that has been documented in the documentation for several years, but has not been documented as a vulnerability before.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-54089 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. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/26/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• filebrowser

Name

• File Browser

Version

• 2.0.0-rc.1

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CPE 2.2info

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