CVE-2026-48777

FileBrowser Quantum is a free, self-hosted, web-based file manager. Versions prior to 1.3.2-stable, 1.4.0-beta and 1.4.1-beta are vulnerable to Path Traversal through the publicPatchHandler in backend/http/public.go which joins user-controlled fromPath and toPath body fields with the trusted d.share.Path BEFORE the downstream sanitizer runs. Because filepath.Join collapses .. segments during the join, the sanitizer in resourcePatchHandler never sees the traversal and the move/copy/rename operates on a path outside the shared directory. The same root-cause pattern was patched for the bulk DELETE endpoint as CVE-2026-44542 (GHSA-fwj3-42wh-8673), but the PATCH handler with the identical pattern was not updated. A public share link with AllowModify=true is sufficient to exploit this. Anyone holding such a link can move, copy, or rename arbitrary files within the share owner's source root. This issue has been fixed in versions 1.3.3-stable and 1.4.2-beta.

CVSS

No CVSS.

References

Link	Resource
https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.3-stable
https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.4.2-beta
https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-qqqm-5547-774x
https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-qqqm-5547-774x

Configurations

No configuration.

History

17 Jun 2026, 15:16

Type	Values Removed	Values Added
References	~~() https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-qqqm-5547-774x -~~	() https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-qqqm-5547-774x -

16 Jun 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-16 20:16

Updated : 2026-06-17 15:16

NVD link : CVE-2026-48777

Mitre link : CVE-2026-48777

CVE.ORG link : CVE-2026-48777

JSON object : View

Products Affected

No product.

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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