Ubiquiti UniFi Network Server up to 10.1.88 Link input validation

CVSS Meta Temp Score
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CTI Interest Score
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8.6$0-$5k0.00

Summaryinfo

A vulnerability classified as very critical was found in Ubiquiti UniFi Network Server up to 10.1.88. This impacts an unknown function of the component Link Handler. Such manipulation leads to input validation. This vulnerability is documented as CVE-2026-22559. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Ubiquiti UniFi Network Server up to 10.1.88. Affected by this issue is an unknown function of the component Link Handler. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

An Improper Input Validation vulnerability in UniFi Network Server may allow unauthorized access to an account if the account owner is socially engineered into clicking a malicious link. Affected Products: UniFi Network Server (Version 10.1.85 and earlier) Mitigation: Update UniFi Network Server to Version 10.1.89 or later.

The advisory is shared for download at community.ui.com. This vulnerability is handled as CVE-2026-22559 since 01/07/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/29/2026).

Upgrading to version 10.1.89 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-14988). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.6

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.8
CNA Vector (hackerone): 🔒

CVSSv2info

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

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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: UniFi Network Server 10.1.89

Timelineinfo

01/07/2026 CVE reserved
03/24/2026 +76 days Advisory disclosed
03/24/2026 +0 days VulDB entry created
03/29/2026 +5 days VulDB entry last update

Sourcesinfo

Advisory: community.ui.com
Status: Confirmed

CVE: CVE-2026-22559 (🔒)
GCVE (CVE): GCVE-0-2026-22559
GCVE (VulDB): GCVE-100-352856
EUVD: 🔒

Entryinfo

Created: 03/24/2026 20:56
Updated: 03/29/2026 10:36
Changes: 03/24/2026 20:56 (63), 03/25/2026 01:35 (1), 03/29/2026 10:36 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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