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EUVD-2026-330439

2026-10-08T00:25:09.203500+00:00

EUVD-2026-330439

fkie_cve-2026-55667

2026-10-08T00:25:09.203536+00:00

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.16, a scoped, non-admin File Browser user holding only the Create permission can delete arbitrary files outside their scope (other tenants' data, and the application's own database) via the upload failure-cleanup path. ScopedFs.RemoveAll is the one dereferencing operation that skips the symlink guard every other method enforces. The direct-upload handler runs RemoveAll on the user-controlled path during failed-upload cleanup, gated only by Perm.Create. If an escaping directory symlink already exists inside the user's scope, an authenticated create-only user can delete an out-of-scope target, bypassing both the ScopedFs boundary and the Perm.Delete gate. This vulnerability is fixed in 2.63.16.

GHSA-fmm7-x4gx-8jhr — File Browser: Out-of-scope file deletion by a Create-only scoped user via symlink-following RemoveAll in upload failure…

2026-10-08T00:25:09.203573+00:00

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

## Summary

A scoped, non-admin File Browser user holding only the **Create** permission can delete arbitrary files outside their scope (other tenants' data, and the application's own database) via the upload failure-cleanup path. This is an incomplete fix of CVE-2026-54094: the v2.63.14 `ScopedFs` containment wrapper was applied to read/write/list/rename but NOT to the delete path. Confidentiality is preserved (reads stay blocked); integrity and availability are not.

`ScopedFs.RemoveAll` is the one dereferencing operation that skips the symlink `guard` every other method enforces. The direct-upload handler runs `RemoveAll` on the user-controlled path during failed-upload cleanup, gated only by `Perm.Create`. If an escaping directory symlink already exists inside the user's scope, an authenticated create-only user can delete an out-of-scope target, bypassing both the `ScopedFs` boundary and the `Perm.Delete` gate.

Affected code: https://github.com/filebrowser/filebrowser/blob/be23ab3a15bf957928ecfed88de5ab67850c1b9c/http/resource.go#L172-L174

## Details

CVE-2026-54094 was fixed by a `ScopedFs` afero wrapper whose `guard()` resolves every path component with `filepath.EvalSymlinks` and rejects out-of-scope targets. `guard()` is invoked on read, write, list, rename, stat, etc. The fix is incomplete; two gaps combine:

1. `ScopedFs.Remove` and `ScopedFs.RemoveAll` skip `guard()` (`files/scoped.go:138-144`) — they call `s.base.Remove/RemoveAll` directly, unlike every other m…