What’s Vulnerable › Vulnerabilities

CVE-2020-5523

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-01-28 · updated 2026-06-17
• Weakness: CWE-295

Description

Android App 'MyPallete' and some of the Android banking applications based on 'MyPallete' do not verify X.509 certificates from servers, and also do not properly validate certificates with host-mismatch, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

Affected products

• 77Bank 77 Bank: through 2.0.1
• Ashikagabank Ashigin: through 1.0.4
• Hokkaidobank Dogin: through 3.0.1
• Hokugin Hokuriku Bank Portal: through 2.0.1
• Naganobank Nagagin: through 1.0.1
• Nttdata Mypallete: all versions
• Shikokubank Shikoku Bank: through 2.0.1
• Sihd-Bk Ikeda Senshu Bank: through 3.0.4
• Tohoku-Bank Tougin: through 1.0.1

References

• http://jvn.jp/en/jp/JVN28845872/index.html
• http://www.dokodemobank.ne.jp/info_20200128_bankingapp.html
• https://www.77bank.co.jp/pdf/oshirase/20012801_appvulnerability.pdf
• https://www.ashikagabank.co.jp/appbanking/pdf/oshirase.pdf
• https://www.hokkaidobank.co.jp/common/dat/2020/0120/15795047141946146699.pdf
• https://www.hokugin.co.jp/info/archives/personal/2020/1913.html
• https://www.naganobank.co.jp/soshiki/2/app-ssl.html
• https://www.shikokubank.co.jp/info/apps20200128.html
• https://www.sihd-bk.jp/common_v2/pdf/20200127.pdf
• https://www.tohoku-bank.co.jp/news/topics/200128_applissl.html
• http://jvn.jp/en/jp/JVN28845872/index.html
• http://www.dokodemobank.ne.jp/info_20200128_bankingapp.html

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