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CVE-2026-25890— File Browser has a Path-Based Access Control Bypass via Multiple Leading Slashes in URL

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.

File Browser是File Browser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 2.57.1之前版本存在安全漏洞，该漏洞源于可通过修改请求URL绕过文件路径规则，可能导致未经授权访问受限文件。

CVSS 8.1 · High EPSS 0.56% · P45
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I. Basic Information for CVE-2026-25890

Vulnerability Information
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Vulnerability Title
File Browser has a Path-Based Access Control Bypass via Multiple Leading Slashes in URL
Source: CVE Program / CVE List V5
Vulnerability Description
File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, preview, rename and edit files. Prior to 2.57.1, an authenticated user can bypass the application's "Disallow" file path rules by modifying the request URL. By adding multiple slashes (e.g., //private/) to the path, the authorization check fails to match the rule, while the underlying filesystem resolves the path correctly, granting unauthorized access to restricted files. This vulnerability is fixed in 2.57.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的解析名称或索引
Source: CVE Program / CVE List V5
Vulnerability Title
File Browser 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
File Browser是File Browser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 2.57.1之前版本存在安全漏洞，该漏洞源于可通过修改请求URL绕过文件路径规则，可能导致未经授权访问受限文件。
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 < 2.57.2 -

II. Public POCs for CVE-2026-25890

# POC Description Source Link Shenlong Link
1 None https://github.com/mbanyamer/CVE-2026-25890-FileBrowser-Access-Control-Bypass POC Details
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III. Intelligence Information for CVE-2026-25890

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IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: filebrowser
Same weakness: CWE-706

V. Comments for CVE-2026-25890

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