EUVD-2026-274758

fkie_cve-2026-28492

File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, preview, rename and edit files. Prior to version 2.61.0, when a user creates a public share link for a directory, the withHashFile middleware in http/public.go uses filepath.Dir(link.Path) to compute the BasePathFs root. This sets the filesystem root to the parent directory instead of the shared directory itself, allowing anyone with the share link to browse and download files from all sibling directories. This issue has been patched in version 2.61.0.

GHSA-mr74-928f-rw69 — FileBrowser has Path Traversal in Public Share Links that Exposes Files Outside Shared Directory

Affected: Go: github.com/filebrowser/filebrowser/v2

### Summary When a user creates a public share link for a **directory**, the `withHashFile` middleware in `http/public.go` (line 59) uses `filepath.Dir(link.Path)` to compute the `BasePathFs` root. This sets the filesystem root to the **parent directory** instead of the shared directory itself, allowing anyone with the share link to browse and download files from all sibling directories.

### Details In `http/public.go` lines 52-64, the `withHashFile` function handles public share link requests:

```go basePath := link.Path // e.g. "/documents/shared" filePath := ""

if file.IsDir { basePath = filepath.Dir(basePath) // BUG: becomes "/documents" (parent!) filePath = ifPath }

d.user.Fs = afero.NewBasePathFs(d.user.Fs, basePath) ```

When a directory at `/documents/shared` is shared, `filepath.Dir("/documents/shared")` evaluates to `"/documents"`. The `BasePathFs` is then rooted at the parent directory `/documents/`, giving the share link access to **everything** under `/documents/` - not just the intended `/documents/shared/`.

This affects both `publicShareHandler` (directory listing via `/api/public/share/{hash}`) and `publicDlHandler` (file download via `/api/public/dl/{hash}/path`).

### PoC

1. Set up filebrowser with a user whose scope contains: 2. - `/documents/shared/public-file.txt` (intended to be shared) 3. - `/documents/secrets/passwords.txt` (NOT intended to be shared) 4. - `/documents/private/financial.csv` (NOT intended to be shared) 2. Cre…

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EUVD-2026-274758

fkie_cve-2026-28492

GHSA-mr74-928f-rw69 — FileBrowser has Path Traversal in Public Share Links that Exposes Files Outside Shared Directory