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CVE-2026-72835— filebrowser before v2.63.21 Access Rule Bypass via Path Canonicalization

Quick assessment

Affected
filebrowser filebrowser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 2.63.21之前版本存在路径遍历漏洞，该漏洞源于评估访问规则前未对路径进行规范化处理，可能导致已认证用户使用大小写变体或反斜杠分隔的路径绕过管理员定义的拒绝规则，未经授权访问被拒绝的文件。

CVSS 6.8 · Medium EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
filebrowser filebrowser < 2.63.21 affected
2.63.21 unaffected
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I. Basic Information for CVE-2026-72835

Vulnerability Information
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Vulnerability Title
filebrowser before v2.63.21 Access Rule Bypass via Path Canonicalization
Source: CVE Program / CVE List V5
Vulnerability Description
filebrowser versions before v2.63.21 fail to canonicalize paths before evaluating access rules, allowing authenticated users to bypass administrator-defined deny rules using case-variant or backslash-separated paths. Attackers can request files with alternate path representations that match no rule but resolve to the same filesystem object, gaining unauthorized access to denied files within their scope.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径等价的解析不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
File Browser 路径遍历漏洞
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 2.63.21之前版本存在路径遍历漏洞，该漏洞源于评估访问规则前未对路径进行规范化处理，可能导致已认证用户使用大小写变体或反斜杠分隔的路径绕过管理员定义的拒绝规则，未经授权访问被拒绝的文件。
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 ~ 2.63.21 -

II. Public POCs for CVE-2026-72835

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III. Intelligence Information for CVE-2026-72835

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Vendor Advisories for CVE-2026-72835 (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-2026-72836 8.1 HIGH FileBrowser before 2.63.19 Case Sensitivity Authentication Bypass
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-41

V. Comments for CVE-2026-72835

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