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CVE-2026-48777— FileBrowser Quantum: Path Traversal in public share PATCH allows file ops outside shared directory

Quick assessment

Affected
gtsteffaniak filebrowser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gtsteffaniak filebrowser是gtsteffaniak的文件管理服务器。 Graham Steffaniak FileBrowser Quantum存在路径遍历漏洞，该漏洞源于后端publicPatchHandler在清理器运行之前将用户控制的fromPath和toPath字段与可信的d.share.Path连接，filepath.Join在连接时折叠..段，导致resourcePatchHandler中的清理器无法检测到路径遍历，从而允许在共享目录之外操作文件。以下版本受到影响：1.

AI Predicted 8.1 Difficulty: Easy EPSS 0.52% · P42

Affected Version Matrix 2

VendorProduct Version RangeStatus
gtsteffaniak filebrowser < 1.3.3-stable affected
>= 1.4.0-beta, < 1.4.2-beta affected
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I. Basic Information for CVE-2026-48777

Vulnerability Information
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Vulnerability Title
FileBrowser Quantum: Path Traversal in public share PATCH allows file ops outside shared directory
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Graham Steffaniak FileBrowser Quantum 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gtsteffaniak filebrowser是gtsteffaniak的文件管理服务器。 Graham Steffaniak FileBrowser Quantum存在路径遍历漏洞，该漏洞源于后端publicPatchHandler在清理器运行之前将用户控制的fromPath和toPath字段与可信的d.share.Path连接，filepath.Join在连接时折叠..段，导致resourcePatchHandler中的清理器无法检测到路径遍历，从而允许在共享目录之外操作文件。以下版本受到影响：1.
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gtsteffaniak filebrowser < 1.3.3-stable -

II. Public POCs for CVE-2026-48777

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III. Intelligence Information for CVE-2026-48777

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Patches & Fixes for CVE-2026-48777 (1)

Vendor Advisories for CVE-2026-48777 (1)

Vendor Pages for CVE-2026-48777 (1)

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: gtsteffaniak
Same weakness: CWE-22

V. Comments for CVE-2026-48777

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