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

CVSS 8.1 · High EPSS 0.32% · P25

Affected Version Matrix 2

VendorProductVersion RangeStatus
filebrowserfilebrowser< 2.63.19affected
2.63.19unaffected
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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

Affected Products

VendorProductAffected VersionsCPESubscribe
filebrowserfilebrowser 0 ~ 2.63.19 -

II. Public POCs for CVE-2026-72836

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 10486 chars
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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-2026-728378.8 HIGHFile Browser before 2.63.20 Privilege Escalation via Proxy Authentication
CVE-2026-728356.8 MEDIUMfilebrowser before v2.63.21 Access Rule Bypass via Path Canonicalization
CVE-2026-728386.5 MEDIUMFileBrowser before 2.63.19 Disk Exhaustion via TUS Upload
CVE-2026-728344.3 MEDIUMfilebrowser 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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