What’s Vulnerable › Vulnerabilities

CVE-2026-116682: FileBrowser Quantum: Symlink following escapes user scope allowing arbitrary file read outside the served directory

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-27 · updated 2026-10-28
• Weakness: CWE-22

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.

Affected products

• gtsteffaniak filebrowser: before 1.5.2-stable; from 2.0.0-beta, < 2.0.1-beta

References

• https://github.com/gtsteffaniak/filebrowser/commit/3c8c02414eefd3351ffe437fa39ff6eb150ffa67
• https://github.com/gtsteffaniak/filebrowser/commit/4126edeb07a015c3809a89249b283e07a4e50c38
• https://github.com/gtsteffaniak/filebrowser/pull/2795
• https://github.com/gtsteffaniak/filebrowser/pull/2800
• https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.5.2-stable
• https://github.com/gtsteffaniak/filebrowser/releases/tag/v2.0.1-beta
• https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-mgqf-5mf5-prfj

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