CVE-2021-20875

6.1 mediumEPSS 0.8%

Medium (6.1) in groupsession groupsession. EPSS 0.8% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.1 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 58% of CVEs (scores of 2026-10-31)
CWE: CWE-601
Published: 2021-12-24
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

groupsession:groupsession

References

https://groupsession.jp/info/info-news/security20211220
https://jvn.jp/en/jp/JVN79798166/index.html
https://groupsession.jp/info/info-news/security20211220
https://jvn.jp/en/jp/JVN79798166/index.html

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