CVE-2021-20873 json
Yappli is an application development platform which provides the function to access a requested URL using Custom URL Scheme.
published 2021-12-28 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8282
- cvss
- 8.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 59%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- yappli yappli 9.30.0
Exploit prediction
0.87% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
Affected products
- Yappli, Inc. Yappli
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
support.yappli.co.jp
/hc/ja/articles/4410249902745
vendor-advisory
-
jvn.jp
/en/jp/JVN66422035/index.html
third-party-advisory
Sources
- CVE List CVE-2021-20873
- NVD CVE-2021-20873
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.