CVE-2021-20835 Missing authorization in Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version)
A remote attacker can trick users into launching arbitrary activities via a custom URL scheme, potentially stealing Mercari account access tokens.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-20835?
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.
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.
Weakness: CWE-862
Which versions are affected by CVE-2021-20835?
It affects 1 product.
Products include Mercari Mercari.
How do I fix CVE-2021-20835?
No fix has been published for CVE-2021-20835 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-20835 being exploited?
There is no known exploitation of CVE-2021-20835 in the wild and no public exploit code.
Other vulnerabilities in Mercari, Inc. Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version)
Sources
Also known as GHSA-2hf9-98xv-3h7h.