{"id":"CVE-2021-20835","aliases":["EUVD-2021-8247","GHSA-2hf9-98xv-3h7h"],"status":"published","title":"Improper authorization in handler for custom URL scheme vulnerability in Android App 'Mercari ...","description":"Improper authorization in handler for custom URL scheme vulnerability in Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) versions prior to 4.49.1 allows a remote attacker to lead a user to access an arbitrary website and the website launches an arbitrary Activity of the app via the vulnerable App, which may result in Mercari account's access token being obtained.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01625,"percentile":0.76356,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-862","CWE-863"],"published":"2021-11-24T08:25:38Z","modified":"2026-06-17T03:34:30Z","products":[{"vendor":"mercari","product":"mercari"},{"vendor":"mercari, inc.","product":"android app 'mercari (merpay) - marketplace and mobile payments app' (japan version)"}],"references":[{"url":"https://jvn.jp/en/jp/JVN49465877/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20835"},{"url":"https://github.com/advisories/GHSA-2hf9-98xv-3h7h"}],"sources":{"cve":[{"id":"CVE-2021-20835","description":"Improper authorization in handler for custom URL scheme vulnerability in Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) versions prior to 4.49.1 allows a remote attacker to lead a user to access an arbitrary website and the website launches an arbitrary Activity of the app via the vulnerable App, which may result in Mercari account's access token being obtained.","status":"published","published":"2021-11-24T08:25:38Z","modified":"2024-08-03T17:53:23.012Z","updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-8247","description":"Improper authorization in handler for custom URL scheme vulnerability in Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) versions prior to 4.49.1 allows a remote attacker to lead a user to access an arbitrary website and the website launches an arbitrary Activity of the app via the vulnerable App, which may result in Mercari account's access token being obtained.","status":"published","published":"2021-11-24T08:25:38Z","modified":"2024-08-03T17:53:23Z","updated_at":"2026-11-03T03:25:07.874589Z"}],"ghsa":[{"id":"GHSA-2hf9-98xv-3h7h","title":"Improper authorization in handler for custom URL scheme vulnerability in Android App 'Mercari ...","description":"Improper authorization in handler for custom URL scheme vulnerability in Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) versions prior to 4.49.1 allows a remote attacker to lead a user to access an arbitrary website and the website launches an arbitrary Activity of the app via the vulnerable App, which may result in Mercari account's access token being obtained.","status":"published","published":"2021-11-25T00:00:38Z","modified":"2023-02-01T05:06:37Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-862","CWE-863"],"updated_at":"2026-11-02T14:50:22.895109Z"}],"nvd":[{"id":"CVE-2021-20835","description":"Improper authorization in handler for custom URL scheme vulnerability in Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) versions prior to 4.49.1 allows a remote attacker to lead a user to access an arbitrary website and the website launches an arbitrary Activity of the app via the vulnerable App, which may result in Mercari account's access token being obtained.","status":"published","published":"2021-11-24T16:15:12.97Z","modified":"2026-06-17T03:34:30.887Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:07:01.428028Z"}]}}