CVE-2026-48777

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-81163 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')… CWE-22
• CVE-2026-112049 Vita3K before build 4187 contains a path traversal (zip slip) vulnerability in… CWE-22
• CVE-2026-112005 WhoDB 0.104.0 before 0.135.0 contains a path traversal vulnerability that allows remote… CWE-22
• CVE-2026-61702 OpenPrinting CUPS is an open source printing system for Linux and other Unix-like… CWE-22
• CVE-2026-104871 The Angular SSR is a server-rise rendering tool for Angular applications. CWE-22
• CVE-2026-102991 Mako is a template library written in Python. CWE-22
• CVE-2026-101894 The decompress package for Node.js extracts archives. CWE-22
• CVE-2026-100689 GitPython before 3.1.62 does not validate the `path` field read from an untrusted… CWE-22