How severe is CVE-2026-3839?

CVE-2026-3839 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-3839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3839?

CVE-2026-3839 affects Unraid. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3839?

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

Does CVE-2026-3839 have an EU (EUVD) identifier?

Yes. CVE-2026-3839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12168.

When was CVE-2026-3839 published?

CVE-2026-3839 was published on 2026-03-16 and last updated on 2026-06-17.

CVE-2026-3839

CVE-2026-3839 is a high-severity vulnerability in Unraid with a CVSS 3.x base score of 7.3. 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: High (CVSS 3.x base score 7.3)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12168
Weakness: CWE-22
Affected product: Unraid
Published: 2026-03-16
Last modified: 2026-06-17

Description

Unraid Authentication Request Path Traversal Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Unraid. Authentication is not required to exploit this vulnerability. The specific flaw exists within the auth-request.php file. The issue results from the lack of proper validation of a user-supplied path prior to using it in authentications. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-28912.

Frequently asked questions

What is CVE-2026-3839?: Unraid Authentication Request Path Traversal Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Unraid. Authentication is not required to exploit this vulnerability. The specific flaw exists within the auth-request.php file. The issue results from the lack of proper validation of a user-supplied path prior to using it in authentications. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-28912.
How severe is CVE-2026-3839?: CVE-2026-3839 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-3839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3839?: CVE-2026-3839 affects Unraid. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-3839 have an EU (EUVD) identifier?: Yes. CVE-2026-3839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12168.
When was CVE-2026-3839 published?: CVE-2026-3839 was published on 2026-03-16 and last updated on 2026-06-17.

References

https://www.zerodayinitiative.com/advisories/ZDI-26-172/

Affected products (1)

cpe:2.3:o:unraid:unraid:7.2.3:*:*:*:*:*:*:*

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