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CVE-2026-44542

Gtsteffaniak Filebrowser Quantum path traversal

9.1 CRITICALPublic exploitEPSS 0.60%
  1. Published14 May 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Gtsteffaniak Filebrowser Quantum< 1.3.1 · < 1.3.9

Remediation

Fixed in
Gtsteffaniak Filebrowser Quantum≥ 1.3.1

References

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Frequently asked

Is CVE-2026-44542 being actively exploited?

CVE-2026-44542 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.60%.

How severe is CVE-2026-44542?

CVE-2026-44542 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.60% probability of exploitation.

Which products are affected by CVE-2026-44542?

Affected products include Gtsteffaniak Filebrowser Quantum.

How do I fix CVE-2026-44542?

Upgrade affected software to a fixed version, for example Gtsteffaniak Filebrowser Quantum 1.3.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-44542 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.