CVE-2026-54088

Summary

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.

Affected Software

Weaknesses

• CWE-78: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
• CWE-88: CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
• CWE-306: CWE-306: Missing Authentication for Critical Function

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-m93h-4hw7-5qcm

References

• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-m93h-4hw7-5qcm

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