A compromised File Browser account can reach the files and actions its scope and permissions allow—but that scope is not a complete security boundary in every setup. A root-scoped account may reach every file File Browser serves; an account with command execution may act with the server process’s operating-system access; and affected versions have had a symlink flaw that could expose reachable files outside a user’s scope.
To judge the impact, check the deployed version, how the account was created, its effective scope and permissions, command-execution settings, symlinks, and the privileges of the operating-system account running File Browser.
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What does a File Browser user’s scope limit?
Scope is the file-tree boundary File Browser assigns to a user for ordinary in-app file operations. A user with a narrow scope and no applicable boundary flaw should be limited to files in that tree, with the actions their permissions allow. Scope does not, by itself, constrain the operating-system account running the server.
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How far can a compromised account reach?
| Account or configuration | Potential reach | What determines the limit |
|---|---|---|
| Ordinary account without Execute permission and without an applicable boundary flaw | Files inside its assigned scope, through the file operations it has been granted. | The effective scope and individual file permissions. |
| Root-scoped account | The tree File Browser serves, potentially including every file served by the instance. | The server root and the account’s granted operations. |
| Account with command execution | Potentially files and resources reachable to the File Browser server process, beyond the user’s File Browser scope. | Execute permission, the commands allowed for that user, and the process’s operating-system privileges. |
| Account whose tree contains a symlink to an out-of-scope target on an affected version | The linked target may be reachable through the symlink, if the server process can access it. | The deployed version, symlink and target layout, and server access to the target. |
These are different paths to impact, not one universal outcome of account compromise. In particular, a compromised account does not automatically gain the server process’s full access: that broader possibility depends on command execution or a boundary flaw and on what the process can reach.
Can one File Browser user see another user’s files?
Not necessarily. If users have separate scopes and no relevant bypass is present, one user’s ordinary in-app access should be limited to their assigned tree. But a shared or root scope can include files used by other accounts, and command execution can bypass File Browser’s scope restriction. On affected versions, a symlink could also point from a user’s tree to another reachable location.
Account origin matters because self-registration may use configured user defaults. The official deployment documentation warns that the default scope is the server root and that a self-registered user could read, modify, and delete every file File Browser serves. It says to enable createUserDir for a separate directory per user, or choose a non-root default scope when users need to share files. The effective settings on the deployed instance—not the account’s label or intended purpose—determine its actual reach.
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What can a self-registered account do by default?
The project advisory GHSA-6759-996p-gpj6 identifies a specific vulnerable configuration: with Signup=true and CreateUserDir=false, File Browser versions <= 2.63.16 could create an account with scope / and create, modify, delete, rename, share, and download permissions. The advisory labels this issue Critical and assigns CVSS 9.8. That score is the advisory’s severity rating, not a probability that an attack will occur or an estimate of resulting loss.
This is an advisory-specific statement about the versions and configuration it names; it does not establish identical behavior for every release or deployment. The advisory lists no patched version. The project repository was reported archived and read-only on August 31, 2026, so do not assume a later upstream release fixes this issue. Verify the exact version and distribution in use, including any packaged or forked build, before relying on a remediation claim.
Does File Browser scope stop command execution?
No. The project’s command-execution advisory says configured commands run as subprocesses with the File Browser server process’s UID, without the user’s File Browser scope being applied. Depending on the permitted commands and the process’s operating-system access, this can expose files across user scopes and the application database, which contains password hashes. The specific impact depends on what commands are allowed and what the process can access.
The account needs Execute permission and an applicable permitted-command configuration for this path to be available. File Browser’s command-execution documentation says hook runner and interactive shell functionality have been disabled by default for existing and new installations from v2.33.8 onward because of known vulnerabilities. Disabled by default does not mean impossible to enable: inspect both the effective global configuration and the compromised user’s command list. The advisory recommends removing Execute permission from all accounts if command execution is not needed.
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A File Browser project advisory, GHSA-239w-m3h6-ch8v, says versions through 2.63.13 could follow symlinks from a scoped user’s tree to targets outside that scope when the target remained reachable to the server process. The advisory describes out-of-scope reads, writes, share creation, and public-share exposure in specified cases; an accessible symlink target was a prerequisite. It identifies version 2.63.14 as patched for this particular advisory. That does not establish that every later vulnerability is fixed.
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How should you assess a real compromise?
Use the settings and filesystem that were effective at the time of the incident. Record these details before deciding what was exposed:
- Build: exact File Browser version and distribution, including whether it is upstream, packaged, or forked.
- Account origin and defaults: whether the account was admin-created or self-registered; whether signup was enabled; the
CreateUserDirsetting; and the effective default scope and permissions. - Account grants: the compromised user’s scope and each granted file capability, plus any assigned command list.
- Execution settings: whether command execution is enabled globally and for that user.
- Filesystem paths: whether the user’s directory or any path leading to it contains symlinks pointing outside the scope, and whether those targets were reachable.
- Process access: the operating-system identity running File Browser, its accessible files and mounts, and whether it had excessive privileges.
For comparisons between two accounts or deployments, use the same axes: account origin, scope, file permissions, Execute permission and commands, symlink targets, version, and server-process access. This separates a broad in-app permission from access obtained through a host-level execution path.
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What changes reduce the risk?
- Turn off public signup unless it is required. If it is required, configure a per-user directory with
createUserDiror set a deliberate non-root default scope appropriate to the sharing model. - Grant only the file operations each account needs; remove unnecessary create, modify, delete, share, and download rights.
- Keep command execution disabled unless there is a specific operational need. If enabled, tightly review permitted commands and who has Execute permission.
- Run the server process with limited operating-system privileges and access only to the files and mounts it needs. This is operational hardening, not a guarantee that File Browser scope itself restricts host access.
- Check the deployed version against the specific signup and symlink advisories, and review symlink handling in the actual filesystem layout.
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