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Medium5.3QNAP

Medium [CVE-2023-39303] QTS: improper authentication vulnerability has been reported to affect several QNAP operating system versions.

This medium-severity QNAP advisory covers CVE-2023-39303 affecting QTS, QuTS hero, QuTScloud.

CVE-2023-39303 Published Feb 2, 2024Updated by vendor Jun 17, 2026
Affected products & platforms
QNAPQTSQuTS hero
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Summary

An improper authentication vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow users to compromise the security of the system via a network.

We have already fixed the vulnerability in the following versions: QTS 5.1.3.2578 build 20231110 and later

QuTScloud c5.1.5.2651 and later

Affected products named by the advisory: QuTS hero.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · medium-confidence parse· fetched 2 months ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · medium-confidence parse· fetched 2 months ago·verify at source

Mitigation

The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.

Official advisory · medium-confidence parse· fetched 2 months ago·verify at source

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