QNAP File Station 5 5.5.6.5208 User Account null pointer dereference

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.1$0-$5k2.07-

Summaryinfo

A vulnerability identified as problematic has been detected in QNAP File Station 5 5.5.6.5208. This impacts an unknown function of the component User Account Handler. Performing a manipulation results in null pointer dereference. This vulnerability is identified as CVE-2026-22899. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in QNAP File Station 5 5.5.6.5208. This affects some unknown functionality of the component User Account Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

A NULL pointer dereference vulnerability has been reported to affect File Station 6. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5208 and later

The weakness was released by coral as qsa-26-19. It is possible to read the advisory at qnap.com. This vulnerability is uniquely identified as CVE-2026-22899 since 01/13/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 5.5.6.5208 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-35973). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: File Station 5 5.5.6.5208

Timelineinfo

01/13/2026 CVE reserved
06/10/2026 +147 days Advisory disclosed
06/10/2026 +0 days VulDB entry created
06/10/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: qnap.com

Advisory: qsa-26-19
Researcher: coral
Status: Confirmed

CVE: CVE-2026-22899 (🔒)
GCVE (CVE): GCVE-0-2026-22899
GCVE (VulDB): GCVE-100-370071
EUVD: 🔒

Entryinfo

Created: 06/10/2026 06:48
Updated: 06/10/2026 19:48
Changes: 06/10/2026 06:48 (69), 06/10/2026 19:48 (1)
Complete: 🔍
Cache ID: 216::103

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