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A compromised File Browser account can do what its scope and permissions allow—but scope is not a complete security boundary in every configuration. A root-scoped account may reach every file File Browser serves; an account with command execution may reach files available to the server process even outside its File Browser scope; and affected versions could follow symlinks to reachable files beyond a user’s assigned tree. The actual impact depends on the deployed version, account settings, filesystem layout, and operating-system privileges of the server process.
What scope and permissions control
Scope is the file-tree boundary File Browser assigns to a user for ordinary in-app file operations. Permissions determine what that user can do within the accessible tree. Depending on the account, those capabilities may include creating, modifying, deleting, renaming, sharing, downloading, or executing commands.
For an account without Execute permission and without an applicable boundary flaw, ordinary application access is limited by its scope and granted file permissions. That is a limit on File Browser operations, not automatically a limit on the operating-system account running the server.
Can one user see another user’s files?
Not simply because both accounts use the same server: under normal in-app operation, access depends on the compromised account’s scope and permissions. Another user’s files may become reachable if the scope includes them, if a relevant symlink issue applies, or if the account can run commands that access files available to the server process.
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How far different account configurations can reach
| Account or configuration | Potential reach | What limits the impact |
|---|---|---|
| Ordinary account, no Execute permission, no applicable boundary flaw | Files and operations allowed by the account’s scope and permissions | The assigned File Browser scope and granted file-operation permissions |
| Root-scoped account | The files served under the server root, with actions allowed by the account’s permissions | Granted capabilities and the files File Browser serves |
| Account with Execute permission and permitted commands | Files and capabilities reachable to the operating-system account running File Browser; this may include files outside the user’s scope and the application database | The commands allowed for the user and the server process’s operating-system privileges |
| Account whose tree contains a symlink to an out-of-scope target, on an affected version | The linked target if it remains reachable to the server process; the advisory describes out-of-scope reads, writes, share creation, and public-share exposure in specified cases | Whether the affected version and conditions apply, and whether the target is reachable |
Why self-signup defaults can expose the served tree
File Browser’s deployment documentation says self-registered accounts inherit configured user defaults, including scope. It warns: “By default, the user scope is the server’s root, so a self-registered user could read, modify, and delete every file File Browser serves.” That warning describes a potentially broad default; it does not mean every deployment necessarily has self-signup enabled or uses those defaults.
The project advisory GHSA-6759-996p-gpj6 identifies a more specific case: with Signup=true and CreateUserDir=false, versions <= 2.63.16 could create an account with scope / and create, modify, delete, rename, share, and download permissions. The advisory labels the issue Critical and gives it a CVSS score of 9.8. That score is the advisory’s severity rating, not a probability of compromise or an estimate of financial loss. The advisory lists no patched version, so do not assume a particular later release fixes this specific issue.
The deployment guidance recommends enabling createUserDir to give each user a separate directory, or choosing a non-root default scope when users need to share files. These settings reduce the reach of self-registered accounts when configured as intended; verify the effective settings and account permissions on the actual deployment.
Command execution can exceed the user’s file scope
Command execution is a separate path from ordinary file browsing. The File Browser project advisory says commands run as subprocesses using the File Browser server process’s operating-system UID, and the user’s File Browser scope is not applied. If an account has Execute permission and commands are permitted, those commands may access files beyond the account’s scope, including the application database containing password hashes, to the extent the server process can access them.
From version 2.33.8 onward, hook runner and interactive shell functionality are documented as disabled by default for existing and new installations because of known vulnerabilities. Disabled by default does not mean impossible to enable: command execution can be configured through user management and global settings. Check both the effective global configuration and the compromised user’s permissions and command list. The advisory recommends removing Execute permission from all accounts when command execution is not needed.
How symlinks can cross a scope boundary
A symbolic link inside a user’s assigned tree can point to a file or directory outside it. The project advisory GHSA-239w-m3h6-ch8v says versions through 2.63.13 could follow such links when the target remained reachable to the server process. It describes out-of-scope reads, writes, share creation, and public-share exposure in specified cases, and identifies version 2.63.14 as patched for this advisory.
This is a version- and condition-specific statement. It does not establish that every later vulnerability is fixed, nor that every symlink exposes its target: the target must be reachable to the server process, and the relevant issue must apply to the deployed version and configuration.
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Establish the following facts before deciding what the account could have reached. Preserve relevant configuration and logs as part of incident response, and avoid changing evidence before it has been collected.
Best Value
- Identify the exact build. Record the File Browser version and distribution, including whether it is upstream, packaged, or a fork. Check the advisories against that specific build; version numbers alone may not describe a downstream package.
- Check signup and account defaults. Determine whether public signup is enabled, the effective
CreateUserDirsetting, the default scope and permissions, and whether the account was self-registered or created by an administrator. - Inspect the compromised account. Record its actual scope and each granted capability, including Execute permission and any assigned command list.
- Verify command-execution settings. Check whether execution is enabled globally and for this user, rather than relying only on a default setting or a version number.
- Map links and paths. Look for symlinks in the user’s tree and symlinked ancestors, identify their targets, and determine whether those targets were accessible to the server process.
- Establish the process’s host access. Determine which filesystems and mounts the operating-system account running File Browser can access, and whether it has privileges beyond those needed to serve its files.
Reduce the reach of future account compromises
- Turn off public signup unless it is needed.
- If signup is needed, use per-user directories or a deliberate non-root default scope, and verify the permissions inherited by new accounts.
- Remove create, modify, delete, share, download, and other capabilities users do not need.
- Keep command execution disabled unless there is a specific operational need; if enabled, tightly review the permitted commands and user assignments.
- Run the server with limited operating-system privileges and restrict its filesystem access to the data it must serve. This is host-hardening guidance, not a guarantee provided by File Browser scope.
- Check version-specific advisories and symlink handling for the exact distribution in use. The repository was reported archived and read-only on August 31, 2026; verify the maintenance and security-update status of the distribution you rely on rather than assuming an upstream fix will arrive.
The practical boundary
A File Browser scope can constrain normal file operations, but it should not be treated as the sole security boundary around a server. For a compromised account, the decisive questions are whether it has root or shared scope, which operations it can perform, whether it can execute commands, whether links lead outside its tree, and what the server process can access on the host.
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