---
id: CVE-2026-72836
title: >-
  FileBrowser before 2.63.19 does not account for case-insensitive filesystems
  when checking home directory ownership during self-registration
summary: >-
  FileBrowser before 2.63.19 does not account for case-insensitive filesystems
  when checking home directory ownership during self-registration. When Signup
  and CreateUserDir are enabled and FileBrowser's root is on a case-insensitive
  files…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-178
published: '2026-08-14'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:32:39.347'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72836'
references:
  - url: >-
      https://github.com/filebrowser/filebrowser/commit/fe7efb2e6afe66774cd86a5b0a03033bd514d0c0
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/filebrowser/filebrowser/security/advisories/GHSA-576v-w77m-gr84
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/filebrowser-before-case-sensitivity-authentication-bypass
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/filebrowser/filebrowser/security/advisories/GHSA-576v-w77m-gr84
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.0055
epssPercentile: 0.43624
ingestedAt: '2026-09-08T21:11:12.278Z'
---

## Overview

FileBrowser before 2.63.19 does not account for case-insensitive filesystems when checking home directory ownership during self-registration. When Signup and CreateUserDir are enabled and FileBrowser's root is on a case-insensitive filesystem (confirmed on Windows/NTFS), two self-registered usernames that differ only in letter case (e.g., CaseVictim and casevictim) are stored as distinct accounts but resolve to the same physical home directory, because the scope-ownership check compares the persisted scope as an exact case-sensitive string. A second registrant can therefore read, overwrite, and delete another account's files through authenticated HTTP endpoints, without needing an existing account or victim interaction.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.