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Vulnerability record · CVE-2026-54089 · published 25 June 2026

CVE-2026-54089: Improper authentication vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.61% · top 52.8% CWE-287 · Improper authenticationCWE-290 · Authentication bypass by spoofing Deferred
9.1CVSS 3.1 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
25 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

LinkTags
https://github.com/filebrowser/filebrowser/blob/main/auth/proxy.go
https://github.com/filebrowser/filebrowser/blob/main/http/auth.go#L121-L137
https://github.com/filebrowser/filebrowser/security/advisories/GHSA-xqp3-jq6g-x3qm
https://github.com/filebrowser/filebrowser/security/advisories/GHSA-xqp3-jq6g-x3qm

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Source: NIST National Vulnerability Database (record CVE-2026-54089), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.