CVE-2026-54090

File Browser: Command Allowlist Bypass via Shell Metacharacter Injection

State: Published
Severity: 8.7 High
Published: Jun 25, 2026
Updated: Jun 26, 2026
Reserved: Jun 11, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-184 Incomplete List of Disallowed Inputs

Affected Products

Product	Versions
filebrowserfilebrowser	< 2.33.8Affected

References

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