CVE-2021-20873
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.84%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- EPSS
- 0.84% probability · 56th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-862
- Affected
- yappli/yappli
- Source
- vultures@jpcert.or.jp
References
- https://jvn.jp/en/jp/JVN66422035/index.htmlThird Party Advisory
- https://support.yappli.co.jp/hc/ja/articles/4410249902745Vendor Advisory
- https://jvn.jp/en/jp/JVN66422035/index.htmlThird Party Advisory
- https://support.yappli.co.jp/hc/ja/articles/4410249902745Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.