What’s Vulnerable › Vulnerabilities

CVE-2026-54090: File Browser: Command Allowlist Bypass via Shell Metacharacter Injection

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-25 · updated 2026-06-26
• Weakness: CWE-77

Description

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.33.8, when a shell interpreter is configured (e.g. /bin/sh -c), the command allowlist can be bypassed through shell metacharacters. The allowlist validates only the first token of user input, but the entire raw string is handed to the shell — semicolons, pipes, backticks, and $() all work to chain arbitrary commands after a permitted one. This vulnerability is fixed in 2.33.8.

Affected products

• filebrowser: before 2.33.8

References

• https://github.com/filebrowser/filebrowser/issues/5199
• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-8c9q-7855-wfxq
• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-8c9q-7855-wfxq

Get alerted when CVE-2026-54090 or the next vulnerability affects your stack