File Browser: Archive builder turns backslash filenames into path traversal (zip-slip)

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Summary

CVECVE-2026-62843
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-15 16:16:52 UTC
Updated2026-07-15 18:15:13 UTC
DescriptionFile Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. From 2.63.6 to 2.63.16, File Browser's archive builder uses strings.ReplaceAll(nameInArchive, "\", "/"), which turns a POSIX filename such as ..\..\evil.sh into the archive entry ../../evil.sh, allowing a user with upload permission to plant a backslash-named file that escapes the extraction directory when another user downloads and extracts the generated zip or tar archive. This issue is fixed in version 2.63.17.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

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

Problem Types: CWE-22 | CWE-23 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-23 CWE-23: Relative Path Traversal

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Filebrowser Filebrowser affected >= 2.63.6, < 2.63.17 Not specified

References

ReferenceSourceLinkTags
github.com/filebrowser/filebrowser/security/advisories/GHSA-83xp-526h-j3ww 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/filebrowser/filebrowser/releases/tag/v2.63.17 [email protected] github.com
github.com/filebrowser/filebrowser/commit/8503ba61ff51d48a7313896483d130... [email protected] github.com
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