CVE-2026-116682

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

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.

Affected

gtsteffaniak · filebrowser

CVSS v3.1 GITHUB

8.6 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS

0.54% chance of exploitation in the next 30 days, 45th percentile

Published

2026-10-27

Proof-of-concept exploits (1)

• advisories/GHSA-mgqf-5mf5-prfjfind archive

CVE references

• gtsteffaniak/filebrowser/commit/3c8c02414eefd3351ffe437fa39ff6eb150ffa67REFERENCE
• gtsteffaniak/filebrowser/commit/4126edeb07a015c3809a89249b283e07a4e50c38REFERENCE
• gtsteffaniak/filebrowser/pull/2795REFERENCE
• gtsteffaniak/filebrowser/pull/2800REFERENCE
• gtsteffaniak/filebrowser/releases/tag/v1.5.2-stableREFERENCE
• gtsteffaniak/filebrowser/releases/tag/v2.0.1-betaREFERENCE
• gtsteffaniak/filebrowser/security/advisories/GHSA-mgqf-5mf5-prfjREFERENCE

References

• CVE Record
• NVD entry