CVE-2026-44542

Description

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.

CVSS v3.1 Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS — Exploit Prediction

0.0097

Probability of exploitation

0.77%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

Affected Products

Vendor	Product	Versions
gtsteffaniak	filebrowser_quantum	< 1.3.1
gtsteffaniak	filebrowser_quantum	< 1.3.9

References

Advisories & Patches

https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-fwj3-42wh-8673 https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-fwj3-42wh-8673

Exploits

https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-fwj3-42wh-8673 https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-fwj3-42wh-8673

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-44542? +

CVE-2026-44542 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0097, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-44542? +

CVE-2026-44542 affects products from gtsteffaniak, specifically: filebrowser_quantum. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-44542? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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