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CVE-2026-34528— File Browser's Signup Grants Execution Permissions When Default Permissions Includes Execution

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 2.62.2之前版本存在安全漏洞，该漏洞源于signupHandler应用默认用户权限后仅剥离Admin权限，未剥离Execute权限和Commands列表，可能导致未经验证的用户在注册后继承shell执行能力并在服务器上运行任意命令。

CVSS 8.1 · High EPSS 0.66% · P50

Possible ATT&CK Techniques 1 AI

T1136.001 · Local Account
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I. Basic Information for CVE-2026-34528

Vulnerability Information
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Vulnerability Title
File Browser's Signup Grants Execution Permissions When Default Permissions Includes Execution
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 version 2.62.2, the signupHandler in File Browser applies default user permissions via d.settings.Defaults.Apply(user), then strips only Admin. The Execute permission and Commands list from the default user template are not stripped. When an administrator has enabled signup, server-side execution, and set Execute=true in the default user template, any unauthenticated user who self-registers inherits shell execution capabilities and can run arbitrary commands on the server. This issue has been patched in version 2.62.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
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 2.62.2之前版本存在安全漏洞，该漏洞源于signupHandler应用默认用户权限后仅剥离Admin权限，未剥离Execute权限和Commands列表，可能导致未经验证的用户在注册后继承shell执行能力并在服务器上运行任意命令。
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 < 2.62.2 -

II. Public POCs for CVE-2026-34528

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5949 chars
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Trigger conditions & impact
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III. Intelligence Information for CVE-2026-34528

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Vendor Advisories for CVE-2026-34528 (1)

Vendor Pages for CVE-2026-34528 (1)

Same Patch Batch · filebrowser · 2026-04-01 · 3 CVEs total

CVE-2026-34529 7.6 HIGH File Browser is vulnerable to Stored Cross-site Scripting via crafted EPUB file
CVE-2026-34530 6.9 MEDIUM File Browser is vulnerable to Stored Cross-Site Scripting via text/template branding injec

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: filebrowser
Same weakness: CWE-269

V. Comments for CVE-2026-34528

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