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[ CVE-2026-116682 · Published 27 Oct 2026 ]

FileBrowser: Symlink following escapes user scope allowing arbitrary file read outside the served directory

CVSS 8.6 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.5.2-stable and 2.0.1-beta, file read handling in backend/pkg/indexing/indexingFiles.go resolves symbolic links through GetRealPath without confirming that the resolved target remains inside the source root and the user's authorized scope. Download, preview, media, OnlyOffice, and public-share read flows that enable FollowSymlinks can therefore serve an out-of-scope target through a reachable in-scope symlink. An authenticated user with download access can read server-accessible files outside the assigned scope, and a holder of a public share link can do the same without an account when the shared directory exposes such a symlink. This issue is fixed in 1.5.2-stable and 2.0.1-beta.

[ Fixes ]Fixes and patches

[ Packages ]Affected open-source packages

  • github.com/gtsteffaniak/filebrowser/backend goAffected < 0.0.0-20260814233832-4126edeb07a0 · fixed in 0.0.0-20260814233832-4126edeb07a0 · GHSA-mgqf-5mf5-prfj

[ References ]References