Medium severity · published Jul 15, 2026
CVE-2026-62843
File Browser: Archive builder turns backslash filenames into path traversal (zip-slip)
6.8
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
None
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
filebrowser · filebrowser
>= 2.63.6, < 2.63.17 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-62843
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-62843
github.com
https://github.com/filebrowser/filebrowser/commit/8503ba61ff51d48a7313896483d130eb6a5abfe0
github.com
https://github.com/filebrowser/filebrowser/releases/tag/v2.63.17
github.com
https://github.com/filebrowser/filebrowser/security/advisories/GHSA-83xp-526h-j3ww
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