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CVE-2026-72839— filebrowser through 2.63.16 Privilege Escalation via Signup

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组织的一款文件浏览管理软件。 File Browser 2.63.16及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于启用自助注册并使用默认CreateUserDir设置时未正确限制范围和权限，可能导致未经身份验证的攻击者注册账户并继承服务器根范围，获得创建、修改、删除、重命名、共享和下载全部文件的完整权限，从而不受限制访问所有文件。

CVSS 9.8 · Critical EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
filebrowser filebrowser ≤ 2.63.16 affected
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I. Basic Information for CVE-2026-72839

Vulnerability Information
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Vulnerability Title
filebrowser through 2.63.16 Privilege Escalation via Signup
Source: CVE Program / CVE List V5
Vulnerability Description
filebrowser through 2.63.16 fails to properly restrict scope and permissions when self-signup is enabled with default CreateUserDir setting. Unauthenticated attackers can register accounts that inherit the server root scope with full create, modify, delete, rename, share, and download permissions, allowing unrestricted access to all files.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
Source: CVE Program / CVE List V5
Vulnerability Title
File Browser 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
File Browser是File Browser组织的一款文件浏览管理软件。 File Browser 2.63.16及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于启用自助注册并使用默认CreateUserDir设置时未正确限制范围和权限，可能导致未经身份验证的攻击者注册账户并继承服务器根范围，获得创建、修改、删除、重命名、共享和下载全部文件的完整权限，从而不受限制访问所有文件。
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 0 ~ 2.63.16 -

II. Public POCs for CVE-2026-72839

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8813 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-72839

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Vendor Advisories for CVE-2026-72839 (2)

Same Patch Batch · filebrowser · 2026-08-13 · 4 CVEs total

CVE-2026-73613 8.2 HIGH filebrowser before 2.63.19 Out-of-Scope File Deletion via Symlink
CVE-2026-73612 8.1 HIGH File Browser before v2.63.22 Authorization Bypass via Recursive Operations
CVE-2026-73611 6.8 MEDIUM File Browser 2.50.0 through 2.63.21 JWT Expiration Bypass

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: filebrowser
Same weakness: CWE-266

V. Comments for CVE-2026-72839

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