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OS Command InjectionWeakness · CWE-78

CVE-2026-54088

CRITICAL · 9.3 CVSS v4.0 Published 2026-06-25
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click 8 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.6, the Hook Authentication feature in File Browser allows administrators to delegate login verification to an external shell command. User-supplied credentials (username and password) are interpolated into this command string using os.Expand without sanitization. An unauthenticated remote attacker can inject shell metacharacters in the username or password field at the login screen, causing the server to execute arbitrary OS commands before any authentication takes place. This is a critical pre-authentication RCE. This vulnerability is fixed in 2.63.6.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

File Browser versions prior to 2.63.6 contain a pre-authentication remote code execution vulnerability in the Hook Authentication feature. The feature allows administrators to delegate login verification to an external shell command, but user-supplied credentials (username and password) are interpolated into the command string using os.Expand without any sanitization. An unauthenticated attacker can inject shell metacharacters in the login fields to execute arbitrary OS commands before authentication occurs.

MitigationImmediately upgrade File Browser to version 2.63.6 or later. If immediate patching is not feasible, disable the Hook Authentication feature until the upgrade can be completed.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify File Browser installation and version
    Locate the File Browser binary or service and retrieve its version number (commonly via 'filebrowser --version' or checking the installed package).
    Affected if The installed version is lower than 2.63.6.
  2. Locate the File Browser configuration file
    Find the configuration file (typically config.json or similar, often in /etc/filebrowser, ~/.filebrowser, or the working directory where File Browser runs).
    Affected if Unable to locate a configuration file may indicate a non-standard installation; proceed to step 3.
  3. Verify if Hook Authentication is enabled
    Open the configuration file and search for an 'auth' or 'authentication' setting. Look for a value that indicates 'hook' or 'external' authentication method.
    Affected if The 'auth' or equivalent field is set to 'hook' or a similar external command configuration.
  4. Confirm command interpolation in Hook Authentication
    In the configuration, locate the 'hook' or 'command' parameter that defines the external authentication script or command.
    Affected if A hook command is defined and enabled, allowing user credentials to be passed to an external shell command.

A user is affected if File Browser version is below 2.63.6 AND the Hook Authentication feature is enabled in the configuration, as this combination allows unauthenticated remote command injection via login field metacharacters.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Immediately upgrade File Browser to version 2.63.6 or later. If immediate patching is not feasible, disable the Hook Authentication feature until the upgrade can be completed.

Recommended fix High confidence

File Browser version 2.63.6

  1. 1. Identify the currently installed File Browser version by checking the application or running 'filebrowser --version'
  2. 2. If running from a package manager (apt, yum, brew, etc.), update the package to version 2.63.6 or later
  3. 3. If running from a binary, download the updated binary for your platform from the official File Browser releases (github.com/filebrowser/filebrowser/releases)
  4. 4. Replace the existing binary with the new version 2.63.6 binary
  5. 5. If using Docker, pull the updated image tag corresponding to version 2.63.6 (e.g., 'filebrowser/filebrowser:v2.63.6')
  6. 6. Restart the File Browser service
  7. 7. Verify the new version is running: 'filebrowser --version' should show 2.63.6 or later
  8. 8. Test that the login page functions normally with the updated version
Caveat Review the release notes between your current version and 2.63.6 for any breaking changes in configuration or behavior

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,120
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-54088 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
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  • Version or environment caveats, and links to real fixes
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