Vulnerability · Published Nov 24, 2021 · Assigned by jpcert

CVE-2021-20835

High 7.5

In plain English

A high-severity security flaw in Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) from Mercari, Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities).

Severity (CVSS NVD)7.5High

Exploit odds (30 days)1.6%top 23.7% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Mercari, Inc.	Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version)	versions prior to 4.49.1

References

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