What’s Vulnerable › Vulnerabilities

CVE-2021-20875

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-24 · updated 2026-06-17
• Weakness: CWE-601

Description

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.

Affected products

• Japan Total System Co.,Ltd. GroupSession: through 5.1.1

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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