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CVE-2026-54089— File Browser: Authentication Bypass via Proxy Auth Header Forgery

Quick assessment

Affected
filebrowser filebrowser
Exploitation
Public or AI PoC available; prioritize validation
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 2.0.0-rc.1版本及之前版本存在授权问题漏洞，该漏洞源于代理身份验证配置不当，可能导致未经身份验证的攻击者通过伪造HTTP标头冒充任何用户包括管理员，并自动创建用户账户。

CVSS 9.1 · Critical EPSS 0.61% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
filebrowser filebrowser >= 2.0.0-rc.1 affected
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I. Basic Information for CVE-2026-54089

Vulnerability Information
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Vulnerability Title
File Browser: Authentication Bypass via Proxy Auth Header Forgery
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. Starting with 2.0.0-rc.1, when FileBrowser is configured with proxy authentication (auth.method=proxy), any unauthenticated attacker who can reach the server directly can impersonate any user - including admin - by sending a single forged HTTP header. No credentials are required. Additionally, specifying a non-existent username causes the server to automatically create a new user account, providing an account creation primitive with no authorization. This is an already known issue that has been documented in the documentation for several years, but has not been documented as a vulnerability before.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
File Browser 授权问题漏洞
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 2.0.0-rc.1版本及之前版本存在授权问题漏洞，该漏洞源于代理身份验证配置不当，可能导致未经身份验证的攻击者通过伪造HTTP标头冒充任何用户包括管理员，并自动创建用户账户。
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 >= 2.0.0-rc.1 -

II. Public POCs for CVE-2026-54089

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7671 chars
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III. Intelligence Information for CVE-2026-54089

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Patches & Fixes for CVE-2026-54089 (2)

Vendor Advisories for CVE-2026-54089 (1)

Same Patch Batch · filebrowser · 2026-06-25 · 10 CVEs total

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-2026-54093 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

Same product: filebrowser
Same vendor: filebrowser
Same weakness: CWE-287

V. Comments for CVE-2026-54089

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