Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M
CVE-2026-54093File Browser: Path traversal in download-as-zip/tar via Windows-style backslash separators in stored filenames
Medium 6.8
In plain English
A medium-severity path traversal in filebrowser from filebrowser. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.6, filebrowser builds the download-as-zip / download-as-tar archive entry names with filepath.ToSlash, which on a Linux host is a no-op for backslashes (\ is only a path separator on Windows). A file whose name contains Windows-style traversal is accepted by the resource handlers, stored on the Linux filesystem with a literal backslash name, and then emitted verbatim as the archive entry name. Windows extractors interpret \ as a path separator and write the extracted file outside the extraction directory — arbitrary file write on the victim who downloads and extracts the archive. This vulnerability is fixed in 2.63.6.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/filebrowser/filebrowser | no fix listed | GHSA-gxjx-7m74-hcq8 |
| Go | github.com/filebrowser/filebrowser | no fix listed | GO-2026-5411 |
| Go | github.com/filebrowser/filebrowser/v2 | 2.63.6 | GHSA-gxjx-7m74-hcq8 |
| Go | github.com/filebrowser/filebrowser/v2 | 2.63.6 | GO-2026-5411 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| filebrowser | filebrowser | < 2.63.6 |
Weakness: CWE-22 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N