How severe is CVE-2026-44542?

CVE-2026-44542 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-44542 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44542?

CVE-2026-44542 primarily affects Gtsteffaniak Filebrowser Quantum. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-44542?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-44542 have an EU (EUVD) identifier?

Yes. CVE-2026-44542 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30344.

When was CVE-2026-44542 published?

CVE-2026-44542 was published on 2026-05-14 and last updated on 2026-06-17.

CVE-2026-44542

CVE-2026-44542 is a critical-severity vulnerability in Gtsteffaniak Filebrowser Quantum with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30344
Weakness: CWE-22
Affected product: Gtsteffaniak Filebrowser Quantum
Published: 2026-05-14
Last modified: 2026-06-17

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.

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.
How severe is CVE-2026-44542?: CVE-2026-44542 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-44542 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44542?: CVE-2026-44542 primarily affects Gtsteffaniak Filebrowser Quantum. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-44542?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-44542 have an EU (EUVD) identifier?: Yes. CVE-2026-44542 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30344.
When was CVE-2026-44542 published?: CVE-2026-44542 was published on 2026-05-14 and last updated on 2026-06-17.

References

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

Affected products (2)

cpe:2.3:a:gtsteffaniak:filebrowser_quantum:*:-:*:*:*:*:*:*
cpe:2.3:a:gtsteffaniak:filebrowser_quantum:*:beta:*:*:*:*:*:*

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