{"id":"CVE-2020-23533","aliases":["EUVD-2020-16277","GHSA-chw7-q7hh-9vc2"],"status":"published","title":"Union Pay up to 1.2.0, for web based versions contains a CWE-347: Improper Verification of...","description":"Union Pay up to 1.2.0, for web based versions 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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00924,"percentile":0.60714,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-347"],"published":"2021-04-06T15:34:59Z","modified":"2026-06-17T03:04:46Z","products":[{"vendor":"unionpayintl","product":"union_pay"}],"references":[{"url":"https://www.dropbox.com/s/6smwnbrp0kgsgrc/poc_code.py?dl=0","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://www.dropbox.com/s/czbkdr73tclq2nr/UnionPay_Vulnerability_Report.txt?dl=0","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"http://mobitec.ie.cuhk.edu.hk/cve_2020/","tags":["x_refsource_MISC","x_transferred","Permissions Required"]},{"url":"https://cwe.mitre.org/data/definitions/347.html","tags":["x_refsource_MISC","x_transferred","Technical Description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-23533"},{"url":"https://github.com/advisories/GHSA-chw7-q7hh-9vc2"}],"sources":{"cve":[{"id":"CVE-2020-23533","description":"Union Pay up to 1.2.0, for web based versions 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.","status":"published","published":"2021-04-06T15:34:59Z","modified":"2024-08-04T14:58:15.204Z","updated_at":"2026-11-02T14:35:49.209579Z"}],"euvd":[{"id":"EUVD-2020-16277","description":"Union Pay up to 1.2.0, for web based versions 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.","status":"published","published":"2021-04-06T15:34:59Z","modified":"2024-08-04T14:58:15Z","updated_at":"2026-11-03T03:07:21.661388Z"}],"ghsa":[{"id":"GHSA-chw7-q7hh-9vc2","title":"Union Pay up to 1.2.0, for web based versions contains a CWE-347: Improper Verification of...","description":"Union Pay up to 1.2.0, for web based versions 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.","status":"published","published":"2022-05-24T17:46:35Z","modified":"2023-01-27T05:03:12Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:42:11.706998Z"}],"nvd":[{"id":"CVE-2020-23533","description":"Union Pay up to 1.2.0, for web based versions 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.","status":"published","published":"2021-04-06T16:15:14.863Z","modified":"2026-06-17T03:04:46.747Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:06:37.687844Z"}]}}