CVE-2026-48777Disclosure

LOWCVSS 9.3 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-22

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Full discourse1 post

CCB Alert@CCBalert137d
Disclosure
Warning: Critical Path Traversal vulnerability in #FileBrowser Quantum. CVE-2026-48777 CVSS:9.3 CVE-2026-44542 CVSS: 9.1. This can lead to unauthorized access to arbitrary files. #Patch #Patch #Patch
Post summary
The post alerts to critical path‑traversal vulnerabilities (CVE-2026-48777, CVE-2026-44542) in FileBrowser Quantum with high CVSS scores, highlights the need for a patch, but provides no proof of exploitation or detailed attack methods.
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