CVE-2023-50363Network attack vector

Authenticated two-step verification bypass

Published Apr 26, 2024 · Updated Aug 2, 2024

Incorrect authorization in QNAP QTS 5.1.x and QuTS hero h5.1.x allows remote authenticated users to bypass two-step verification. QNAP has not disclosed the affected component or the authorization check that mishandles authenticated network requests. A valid user account and network access to the NAS are required; exploitation removes the second-factor gate but does not grant unauthenticated entry.

CVSS severity7.4
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect authorization in QNAP QTS 5.1.x and QuTS hero h5.1.x allows remote authenticated users to bypass two-step verification. QNAP has not disclosed the affected component or the authorization check that mishandles authenticated network requests. A valid user account and network access to the NAS are required; exploitation removes the second-factor gate but does not grant unauthenticated entry.

The record

CVE
CVE-2023-50363
Published
Apr 26, 2024
Updated
Aug 2, 2024
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-285, CWE-863, T1556.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=h5.1.x <h5.1.6.2734 build 20240414

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=h5.1.x <h5.1.6.2734 build 20240414
Linn Products Limited · QTSversion=5.1.x <5.1.6.2722 build 20240402

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
7.4QNAP Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
CWE-863Incorrect Authorization
T1556.006Modify Authentication Process: Multi-Factor Authentication

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo