CVE-2021-20789 - CVE House
Back to Database
Status published Medium CVE-2021-20789

Open redirect vulnerability in GroupSession (GroupSession Free edition from ver2.2.0...

Vulnerability Description

Open redirect vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to redirect a user to an arbitrary web site and conduct a phishing attack via a specially crafted URL.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-20789

Credits & Attribution

No credits recorded in the NVD database.

References

More from Japan Total System Co.,Ltd.

View All →
CVE-2025-66284
Stored cross-site scripting vulnerabilities exist in GroupSession Free edition prior...
Medium 4.8
CVE-2025-65120
Reflected cross-site scripting vulnerability exists in GroupSession Free edition prior...
Medium 5.1
CVE-2025-64781
In GroupSession Free edition prior to ver5.7.1, GroupSession byCloud prior...
Medium 5.1
CVE-2025-62192
SQL Injection vulnerability exists in GroupSession Free edition prior to...
Medium 5.3
CVE-2025-61987
GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to...
Medium 6.9

Affected Vendor

Japan Total System Co.,Ltd.

View all reports →

Affected Software

GroupSession
Vulnerable Versions:
GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0

Timeline

Official Publish: July 28th, 2021
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.