What’s Vulnerable › Vulnerabilities

CVE-2021-20835

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-24 · updated 2026-06-17
• Weakness: CWE-862

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.

Affected products

• Mercari, Inc. "Mercari" App for Android: before 4.49.1 — fixed in 4.49.1

How to fix

Upgrade to a fixed version: Mercari, Inc. "Mercari" App for Android 4.49.1. Check the vendor advisory for mitigations.

References

• https://jvn.jp/en/jp/JVN49465877/index.html
• https://jvn.jp/en/jp/JVN49465877/index.html

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