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Fencer Vulns
medium 6.8

CVE-2026-62843 json

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

published 2026-07-15 3 mo ago modified 2026-07-22 3 mo ago also GHSA-83xp-526h-j3ww , GO-2026-6026 , EUVD-2026-44707

cvss
6.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/filebrowser/filebrowser/v2 2.63.17
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/filebrowser/filebrowser/security/advisories/GHSA-83xp-526h-j3ww referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
GitHub 3.1 6.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/filebrowser/filebrowser/v2
>=2.63.6, <2.63.17
2.63.17
go github.com/filebrowser/filebrowser
all versions
 no fix listed

Affected products

  • filebrowser filebrowser

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory
  • CWE-23 Relative Path Traversal

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.