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Vulnerability · Published Oct 27, 2026 · Assigned by GitHub_M

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

High 8.6

In plain English

A high-severity path traversal in filebrowser from gtsteffaniak. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.5%top 54.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/gtsteffaniak/filebrowser/backend0.0.0-20260814233832-4126edeb07a0GHSA-mgqf-5mf5-prfj
Gogithub.com/gtsteffaniak/filebrowser/backend0.0.0-20260814233832-4126edeb07a0GO-2026-6870

Affected products (as reported)

VendorProductVersions
gtsteffaniak filebrowser < 1.5.2-stable>= 2.0.0-beta, < 2.0.1-beta

Weakness: CWE-22, CWE-59 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

References