CVE-2026-54090— File Browser: Command Allowlist Bypass via Shell Metacharacter Injection
Quick assessment
Affected
filebrowser filebrowser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
FileBrowser是filebrowser团队开源的一个文件管理界面，在指定的目录，它可以用来上传、删除、预览和编辑文件。 File Browser 2.33.8之前版本存在安全漏洞，该漏洞源于命令白名单仅验证用户输入的第一个令牌，但原始字符串被直接传递给shell，允许分号、管道、反引号和$()等元字符绕过白名单，可能导致任意命令执行。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting InterpreterAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| filebrowser | filebrowser | < 2.33.8 |
affected |
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I. Basic Information for CVE-2026-54090
Vulnerability Information
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Vulnerability Title
File Browser: Command Allowlist Bypass via Shell Metacharacter Injection
Source: CVE Program / CVE List V5
Vulnerability 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 $() all work to chain arbitrary commands after a permitted one. This vulnerability is fixed in 2.33.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
File Browser 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FileBrowser是filebrowser团队开源的一个文件管理界面，在指定的目录，它可以用来上传、删除、预览和编辑文件。 File Browser 2.33.8之前版本存在安全漏洞，该漏洞源于命令白名单仅验证用户输入的第一个令牌，但原始字符串被直接传递给shell，允许分号、管道、反引号和$()等元字符绕过白名单，可能导致任意命令执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| filebrowser | filebrowser | < 2.33.8 | - |
|
II. Public POCs for CVE-2026-54090
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-54090 (1)
Same Patch Batch · filebrowser · 2026-06-25 · 10 CVEs total
| CVE-2026-54089 | 9.1 CRITICAL | File Browser: Authentication Bypass via Proxy Auth Header Forgery |
| CVE-2026-54096 | 8.4 HIGH | File Browser: Improper Access Control Occurs via Pre-Created Public Share for a Non-existe |
| CVE-2026-55667 | 8.2 HIGH | File Browser: Out-of-scope file deletion by a Create-only scoped user via symlink-followin |
| CVE-2026-54094 | 7.5 HIGH | File Browser: Symlink following lets scoped users read, overwrite, and share files outside |
| CVE-2026-54091 | 7.5 HIGH | File Browser: Incorrect access control in public directory shares via rule path rebasing |
| CVE-2026-54092 | 6.5 MEDIUM | File Browser: DoS Vulnerability on Public Login API |
| CVE-2026-54088 | File Browser: Command Injection via Authentication Hook Shell Substitution (Pre-Authentica | |
| CVE-2026-54093 | File Browser: Path traversal in download-as-zip/tar via Windows-style backslash separators | |
| CVE-2026-54097 | File Browser: Cross-user unauthorized share-link deletion via unbounded prefix match in De |
IV. Related Vulnerabilities
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CVE-2026-82237
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-
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Same weakness: CWE-77
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V. Comments for CVE-2026-54090
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