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CVE-2026-54093— File Browser: Path traversal in download-as-zip/tar via Windows-style backslash separators in stored filenames

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 2.63.6之前版本存在路径遍历漏洞，该漏洞源于构建下载压缩包时使用filepath.ToSlash处理文件名，导致包含Windows风格路径遍历字符的文件名被原样作为压缩条目名称，Windows解压工具将反斜杠解释为路径分隔符，可能将文件写入提取目录之外的位置，导致受害者下载并解压时遭受任意文件写入攻击。

AI Predicted 5.5 Difficulty: Easy EPSS 0.19% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
filebrowser filebrowser < 2.63.6 affected
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I. Basic Information for CVE-2026-54093

Vulnerability Information
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Vulnerability Title
File Browser: Path traversal in download-as-zip/tar via Windows-style backslash separators in stored filenames
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 2.63.6, filebrowser builds the download-as-zip / download-as-tar archive entry names with filepath.ToSlash, which on a Linux host is a no-op for backslashes (\ is only a path separator on Windows). A file whose name contains Windows-style traversal is accepted by the resource handlers, stored on the Linux filesystem with a literal backslash name, and then emitted verbatim as the archive entry name. Windows extractors interpret \ as a path separator and write the extracted file outside the extraction directory — arbitrary file write on the victim who downloads and extracts the archive. This vulnerability is fixed in 2.63.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
File Browser 路径遍历漏洞
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 2.63.6之前版本存在路径遍历漏洞，该漏洞源于构建下载压缩包时使用filepath.ToSlash处理文件名，导致包含Windows风格路径遍历字符的文件名被原样作为压缩条目名称，Windows解压工具将反斜杠解释为路径分隔符，可能将文件写入提取目录之外的位置，导致受害者下载并解压时遭受任意文件写入攻击。
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 < 2.63.6 -

II. Public POCs for CVE-2026-54093

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III. Intelligence Information for CVE-2026-54093

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Vendor Advisories for CVE-2026-54093 (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-2026-54090 File Browser: Command Allowlist Bypass via Shell Metacharacter Injection
CVE-2026-54088 File Browser: Command Injection via Authentication Hook Shell Substitution (Pre-Authentica
CVE-2026-54097 File Browser: Cross-user unauthorized share-link deletion via unbounded prefix match in De

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: filebrowser
Same weakness: CWE-22

V. Comments for CVE-2026-54093

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