CVE-2026-3839VulnerabilityPublished 9 Mar 2026

ZDI-26-172: Unraid Authentication Request Path Traversal Authentication Bypass Vulnerability

Source Zero Day Initiative

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Not known to be exploited.

Data as of 30 Oct 2026, 11:52 UTC

Severity

High

Rated High by Zero Day Initiative · No CVSS score from NVD or the CNA

EPSS: 0.7% chance of exploitation in 30 days – higher than 54% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

remote

What to do

AI-suggested

Apply the official fix by upgrading Unraid to version 7.2.4 or later. This update addresses the path traversal validation flaw in auth-request.php and mitigates the authentication bypass vulnerability. No additional mitigations are specified or required once the patch is applied.

Description

This vulnerability allows remote attackers to bypass authentication on affected installations of Unraid. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.3. The following CVEs are assigned: CVE-2026-3839.

Impact

Successful exploitation results in authentication bypass, allowing remote attackers to gain unauthorized access to affected Unraid systems. This can lead to potential compromise of system confidentiality, integrity, and availability. No known active exploitation has been reported at the time of disclosure.

Summary

The Unraid Authentication Request Path Traversal Authentication Bypass Vulnerability (CVE-2026-3839) is caused by insufficient validation of a user-supplied path in the auth-request.php file. This allows remote attackers to bypass authentication mechanisms entirely, gaining unauthorized access to the system. The vulnerability was reported to the vendor on February 17, 2026, and publicly disclosed on March 9, 2026. The vendor addressed the issue by releasing a fixed version 7.2.4 of Unraid. The vulnerability has a CVSS v3 base score of 7.3, reflecting its network attack vector, low attack complexity, no required privileges or user interaction, and impacts on confidentiality, integrity, and availability.

References

zerodayinitiative.com/advisories/ZDI-26-172/ (opens in a new tab)

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