{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-20835 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-20835 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-20835 is a high-severity missing authorization vulnerability in Mercari, Inc. Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version), published on 24 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-20835 and fix it if it is affected.\n\nWhat it is: CVE-2021-20835 is a high-severity missing authorization vulnerability in Mercari, Inc. Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version), published on 24 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-20835 in the wild and no public exploit code.\n\nAffected product: Mercari, Inc. Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version). No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-20835/ (Markdown: https://insights.sbomify.com/CVE-2021-20835/index.md)","id":"CVE-2021-20835","markdown":"https://insights.sbomify.com/CVE-2021-20835/index.md","name":"CVE-2021-20835","record":{"aliases":["GHSA-2hf9-98xv-3h7h"],"analysis":{"component_type":"mobile_application","fix_type":"upgrade","impacts":["account_takeover","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Mercari Android App","requires_auth":"none","summary":"A remote attacker can trick users into launching arbitrary activities via a custom URL scheme, potentially stealing Mercari account access tokens.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"jpcert","cpe":[{"product":"mercari","vendor":"mercari"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-862","name":"Missing Authorization"}],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Missing authorization in Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version)","id":"CVE-2021-20835","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Memory corruption in OMRON CX-Supervisor","id":"CVE-2021-20836"},"packages":[],"prev":{"headline":"Missing authorization in Nike App for Android versions prior to 2.177 and Nike App for iOS versions prior to 2.177.1","id":"CVE-2021-20834"},"products":["Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version)"],"published":"2021-11-24","related":[{"cvss_score":8.1,"headline":"Code injection in Android App 'Mercari' (Japan version)","id":"CVE-2020-5604","kev_date_added":null,"published":"2020-07-09"},{"cvss_score":6.1,"headline":"Open redirect in \"Mercari\" App for Android","id":"CVE-2024-23388","kev_date_added":null,"published":"2024-01-26"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["Mercari, Inc."]},"summary":"A remote attacker can trick users into launching arbitrary activities via a custom URL scheme, potentially stealing Mercari account access tokens.","url":"https://insights.sbomify.com/CVE-2021-20835/"}