{"cve":"CVE-2026-48777","nvd":{"published":"2026-06-16T20:16:46.583","modified":"2026-10-25T23:10:00.167","status":"Deferred","description":"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_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":9.3},"cvss_v3":null,"cwes":["CWE-22"],"references":["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"],"products":[],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-48777","score":0.00446,"percentile":0.38535,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-qqqm-5547-774x","url":"https://osv.dev/vulnerability/GHSA-qqqm-5547-774x","summary":"FileBrowser Quantum: Path traversal in public share PATCH allows file ops outside shared directory","modified":"2026-06-25T23:11:33.520625758Z","packages":[{"ecosystem":"Go","name":"github.com/gtsteffaniak/filebrowser/backend","purl":"pkg:golang/github.com/gtsteffaniak/filebrowser/backend","ranges":["<0.0.0-20260518193514-28e9b81e438e"],"fixed":["0.0.0-20260518193514-28e9b81e438e"]}]},{"id":"GO-2026-5591","url":"https://osv.dev/vulnerability/GO-2026-5591","summary":"FileBrowser Quantum: Path traversal in public share PATCH allows file ops outside shared directory in github.com/gtsteffaniak/filebrowser/backend","modified":"2026-06-25T23:01:24.148241131Z","packages":[{"ecosystem":"Go","name":"github.com/gtsteffaniak/filebrowser/backend","purl":"pkg:golang/github.com/gtsteffaniak/filebrowser/backend","ranges":["<0.0.0-20260518193514-28e9b81e438e"],"fixed":["0.0.0-20260518193514-28e9b81e438e"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}