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CVE-2026-35605— File Browser has an access rule bypass via HasPrefix without trailing separator in path matching

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 2.63.1之前版本存在路径遍历漏洞，该漏洞源于rules/rules.go中的Matches函数在匹配路径与访问规则时，使用strings.HasPrefix而未添加尾部目录分隔符，可能导致规则意外匹配其他目录。

AI Predicted 9.1 Difficulty: Trivial EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-35605

Vulnerability Information
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Vulnerability Title
File Browser has an access rule bypass via HasPrefix without trailing separator in path matching
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 2.63.1, the Matches() function in rules/rules.go uses strings.HasPrefix() without a trailing directory separator when matching paths against access rules. A rule for /uploads also matches /uploads_backup/, granting or denying access to unintended directories. This vulnerability is fixed in 2.63.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
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 2.63.1之前版本存在路径遍历漏洞，该漏洞源于rules/rules.go中的Matches函数在匹配路径与访问规则时，使用strings.HasPrefix而未添加尾部目录分隔符，可能导致规则意外匹配其他目录。
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 < 2.63.1 -

II. Public POCs for CVE-2026-35605

# POC Description Source Link Shenlong Link
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default-local-qwen3.6 · 9144 chars
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III. Intelligence Information for CVE-2026-35605

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Vendor Advisories for CVE-2026-35605 (1)

Same Patch Batch · filebrowser · 2026-04-07 · 5 CVEs total

CVE-2026-35607 8.1 HIGH File Browser: Proxy auth auto-provisioned users inherit Execute permission and Commands
CVE-2026-35585 File Browser has a Command Injection via Hook Runner
CVE-2026-35604 File Browser share links remain accessible after Share/Download permissions are revoked
CVE-2026-35606 File Browser discloses text file content via /api/resources endpoint bypassing Perm.Downlo

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: filebrowser
Same weakness: CWE-22

V. Comments for CVE-2026-35605

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