What’s Vulnerable › Vulnerabilities

CVE-2026-54088: File Browser: Command Injection via Authentication Hook Shell Substitution (Pre-Authentication RCE)

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-25 · updated 2026-06-25
• Weakness: CWE-78

Description

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 products

• filebrowser: before 2.63.6

References

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

Get alerted when CVE-2026-54088 or the next vulnerability affects your stack