Moderate severityNVD Advisory· Published Jul 15, 2026· Updated Jul 15, 2026
File Browser: Archive builder turns backslash filenames into path traversal (zip-slip)
CVE-2026-62843
Description
File 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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/filebrowser/filebrowser/v2Go | >= 2.63.6, < 2.63.17 | 2.63.17 |
Affected products
1- Range: 2.63.6 - 2.63.16
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-83xp-526h-j3wwghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-62843ghsaADVISORY
- github.com/filebrowser/filebrowser/commit/8503ba61ff51d48a7313896483d130eb6a5abfe0ghsax_refsource_MISCWEB
- github.com/filebrowser/filebrowser/releases/tag/v2.63.17ghsax_refsource_MISCWEB
- github.com/filebrowser/filebrowser/security/advisories/GHSA-83xp-526h-j3wwghsax_refsource_CONFIRMWEB
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