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CVE-2026-55668— File Browser: ScopedFs follows a dangling symlink on write, letting a scoped user create files outside their scope

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 File Browser是File Browser团队的一款文件浏览管理软件。 File Browser 2.63.16之前版本存在安全漏洞，该漏洞源于ScopedFs验证悬空符号链接的最近现有祖先在范围内，然后在文件创建期间跟随符号链接，允许已验证用户利用Create和Modify权限在用户范围外创建攻击者控制的文件。

CVSS 6.3 · Medium EPSS 0.38% · P29

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
filebrowser filebrowser < 2.63.16 affected
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I. Basic Information for CVE-2026-55668

Vulnerability Information
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Vulnerability Title
File Browser: ScopedFs follows a dangling symlink on write, letting a scoped user create files outside their scope
Source: CVE Program / CVE List V5
Vulnerability Description
File Browser provides a web file managing interface. Prior to 2.63.16, ScopedFs validates the nearest existing ancestor of a dangling symlink as in scope and then follows the symlink during file creation, allowing an authenticated user with Create and Modify permissions to create attacker-controlled files outside the user's scope. This issue is fixed in version 2.63.16.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A: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 File Browser是File Browser团队的一款文件浏览管理软件。 File Browser 2.63.16之前版本存在安全漏洞，该漏洞源于ScopedFs验证悬空符号链接的最近现有祖先在范围内，然后在文件创建期间跟随符号链接，允许已验证用户利用Create和Modify权限在用户范围外创建攻击者控制的文件。
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 < 2.63.16 -

II. Public POCs for CVE-2026-55668

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III. Intelligence Information for CVE-2026-55668

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Patches & Fixes for CVE-2026-55668 (1)

Vendor Advisories for CVE-2026-55668 (1)

Vendor Pages for CVE-2026-55668 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-55668

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