Missing authorization in Mercari, Inc. Android App 'Mercari - Marketplace and Mobile…
Priority LOW 36CWE-862Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-862.
Summary
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.
Why it matters now
EPSS 0.01625 76th percentileScored 2026-11-07
Fix Fixed Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) (Mercari, Inc.): 4.49.1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mercari, Inc. | Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) | before 4.49.1 | 4.49.1 | Patch available | CNA |
- Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) VendorMercari, Inc. Affected before 4.49.1 Fixed in 4.49.1 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mercari:mercari:*:*:*:*:*:android:*:* | before 4.49.1 | Vulnerable | Mercari, Inc. |
- cpe:2.3:a:mercari:mercari:*:*:*:*:*:android:*:* Versions before 4.49.1 Vulnerable ·Mercari, Inc.
Remediation
- Fix · CNA Android App 'Mercari (Merpay) - Marketplace and Mobile Payments App' (Japan version) (Mercari, Inc.) Fixed in 4.49.1
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20835
- 2026-10-03 Alias added: GHSA-2hf9-98xv-3h7h
References
More Mercari, Inc. Mercari vulnerabilities
- TI-2020-04573 Android App 'Mercari' (Japan version) prior to version 3.52.0 allows arbitrary method… CVSS 3.1HIGH 8.1
- TI-2024-15485 Missing authorization in Mercari, Inc. "Mercari" App for Android CVSS 3.1MEDIUM 6.1
Sources
- CVE-2021-20835 · CVE Program
- CVE-2021-20835 · NVD
- FIRST EPSS
- GHSA-2hf9-98xv-3h7h · GitHub Advisory Database · CC BY 4.0
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