Path Traversal in Gtsteffaniak Filebrowser
CVE-2026-44542
FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-stable and 1.3.9-beta, attacker-controlled path input is joined with a trusted base path prior to sanitization, allowing traversal sequences (e.g., ../) to escape the intended shared directory. As a result, an unauthenticated attacker possessing a valid public share hash with delete permissions enabled can delete arbitrary files outside the shared directory within the share owner’s configured storage scope. This affects public/api/resources and public/api/resources/bulk. This vulnerability is fixed in 1.3.1-stable and 1.3.9-beta.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (48.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Gtsteffaniak Filebrowser — versions < 1.3.1-stable, < 1.3.9-beta
- Gtsteffaniak Filebrowser Quantum
Weakness classification (CWE)
References
- github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-fwj3-42wh-8673 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-44542?
- CVE-2026-44542 is a critical-severity vulnerability in Gtsteffaniak Filebrowser, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-05-14.
- How severe is CVE-2026-44542?
- Critical severity. CVSS v3 base score is 9.1 out of 10.