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CVE-2026-72836— FileBrowser before 2.63.19 Case Sensitivity Authentication Bypass

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 2.63.19之前版本存在输入验证错误漏洞，该漏洞源于自注册检查主目录所有权时未考虑文件系统不区分大小写的特性，可能导致攻击者通过身份验证的HTTP端点读取、覆盖和删除其他账户的文件。

CVSS 8.1 · High EPSS 0.55% · P44

Affected Version Matrix 2

VendorProduct Version RangeStatus
filebrowser filebrowser < 2.63.19 affected
2.63.19 unaffected
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I. Basic Information for CVE-2026-72836

Vulnerability Information
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Vulnerability Title
FileBrowser before 2.63.19 Case Sensitivity Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
FileBrowser before 2.63.19 does not account for case-insensitive filesystems when checking home directory ownership during self-registration. When Signup and CreateUserDir are enabled and FileBrowser's root is on a case-insensitive filesystem (confirmed on Windows/NTFS), two self-registered usernames that differ only in letter case (e.g., CaseVictim and casevictim) are stored as distinct accounts but resolve to the same physical home directory, because the scope-ownership check compares the persisted scope as an exact case-sensitive string. A second registrant can therefore read, overwrite, and delete another account's files through authenticated HTTP endpoints, without needing an existing account or victim interaction.
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
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
File Browser 输入验证错误漏洞
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 2.63.19之前版本存在输入验证错误漏洞，该漏洞源于自注册检查主目录所有权时未考虑文件系统不区分大小写的特性，可能导致攻击者通过身份验证的HTTP端点读取、覆盖和删除其他账户的文件。
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 ~ 2.63.19 -

II. Public POCs for CVE-2026-72836

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10486 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-2026-72836

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Patches & Fixes for CVE-2026-72836 (1)

Vendor Advisories for CVE-2026-72836 (2)

Same Patch Batch · filebrowser · 2026-08-14 · 5 CVEs total

CVE-2026-72837 8.8 HIGH File Browser before 2.63.20 Privilege Escalation via Proxy Authentication
CVE-2026-72835 6.8 MEDIUM filebrowser before v2.63.21 Access Rule Bypass via Path Canonicalization
CVE-2026-72838 6.5 MEDIUM FileBrowser before 2.63.19 Disk Exhaustion via TUS Upload
CVE-2026-72834 4.3 MEDIUM filebrowser before 2.63.19 Permission Bypass via checksum

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: filebrowser
Same weakness: CWE-178

V. Comments for CVE-2026-72836

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