CVE-2026-54090

HIGH

File Browser: Command Allowlist Bypass via Shell Metacharacter Injection

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/filebrowser/filebrowser/issues/5199

Scores

CVSS v4 8.7
EPSS 0.0032
EPSS Percentile 24.8%
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/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

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-184 CWE-77
Status published
Products (2)
filebrowser/filebrowser 0 - 2.33.8Go
filebrowser/filebrowser < 2.33.8
Published Jun 25, 2026
Tracked Since Jun 26, 2026