CVE-2020-36284: Unionpayintl Union Pay

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

Union Pay up to 3.4.93.4.9, for android, contains a CWE-347: Improper Verification of Cryptographic Signature vulnerability, allows attackers to shop for free in merchants' websites and mobile apps, via a crafted authentication code (MAC) which is generated based on a secret key which is NULL.

Affected products

Published 2021-04-06. Last modified 2026-06-17.