CVE-2021-20875 json
Open redirect vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession…
published 2021-12-24 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8284
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 58%
- public exploits
- 0
- none known
Summary
Open redirect vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows a remote unauthenticated attacker to redirect users to arbitrary web sites and conduct phishing attacks by having a user to access a specially crafted URL.
Exploit prediction
0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
Affected products
- Japan Total System Co.,Ltd. GroupSession Free edition, GroupSession byCloud, GroupSession ZION
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
groupsession.jp
/info/info-news/security20211220
vendor-advisory
-
jvn.jp
/en/jp/JVN79798166/index.html
third-party-advisory
Sources
- CVE List CVE-2021-20875
- NVD CVE-2021-20875
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