CVE-2026-62843
File Browser: Archive builder turns backslash filenames into path traversal (zip-slip)
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium6.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N |
| NVDNVD · Deferred | 3.1 | Medium6.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.39% · top 67% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Weakness
Affected products
- affected >= 2.63.6, < 2.63.17
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/filebrowser/filebrowser/v2GHSA-83xp-526h-j3ww (opens in a new tab)
References (3)
- https://github.com/filebrowser/filebrowser/security/advisories/GHSA-83xp-526h-j3ww (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/filebrowser/filebrowser/commit/8503ba61ff51d48a7313896483d130eb6a5abfe0 (opens in a new tab)x_refsource_MISC
- https://github.com/filebrowser/filebrowser/releases/tag/v2.63.17 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-83xp-526h-j3ww (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-62843)Record last updated .