CVE-2026-62843CWE-22CWE-23

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

Medium · published July 15, 2026

CVSS v3.1
6.8
EPSS
0%
Percentile
32.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00391 · 32.1th percentile
Weaknesses
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'); CWE-23 · Relative Path Traversal
Published
2026-07-15T15:42Z
EPSS history
Timeline
  • 15 JUL 15:42Z
    File Browser: Archive builder turns backslash filenames into path traversal (zip-slip)
    cvelistv5