goo blog App fails to restrict custom URL schemes properly


goo blog App by NTT Resonant Incorporated provides the function to access a requested URL using Custom URL Scheme.
The App does not restrict access to the function properly (CWE-284) which may be exploited to direct the App to access any sites.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 4.3 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: None
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 4.3 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

NTT Resonant Inc.@
  • goo blog App for Android ver.1.2.25 and earlier
  • goo blog App for iOS ver.1.3.3 and earlier


A remote attacker may lead a user to access an arbitrary website via the vulnerable App. As a result, the user may become a victim of a phishing attack.

[Update the Application]
Update the application to the latest version according to the information provided by the developer.
The developer has released the following versions.
*goo blog App for Android ver.1.2.26
*goo blog App for iOS ver.1.3.4
Vendor Information

NTT Resonant Inc.@
CWE (What is CWE?)

  1. Permissions(CWE-264) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2021-20728

  1. JVN : JVN#91691168
  2. National Vulnerability Database (NVD) : CVE-2021-20728
Revision History

  • [2021/06/02]
      Web page was published