File Browser: ScopedFs follows a dangling symlink on write, letting a scoped user create files outside their scope

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Summary

CVECVE-2026-55668
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 15:16:30 UTC
Updated2026-07-08 17:17:24 UTC
DescriptionFile 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.

Risk And Classification

Primary CVSS: v3.1 6.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N

Problem Types: CWE-22 | CWE-59 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-59 CWE-59: Improper Link Resolution Before File Access ('Link Following')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
3.1CNADECLARED6.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Filebrowser Filebrowser affected < 2.63.16 Not specified

References

ReferenceSourceLinkTags
github.com/filebrowser/filebrowser/security/advisories/GHSA-8wc8-hf36-mjh9 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/filebrowser/filebrowser/releases/tag/v2.63.16 [email protected] github.com
github.com/filebrowser/filebrowser/commit/64511ce45e3be379e965f7f4fb0929... [email protected] github.com
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