Reflected Cross-Site Scripting Vulnerability in GroupSession by GroupSession Inc.
CVE-2025-65120

5.1MEDIUM

Key Information:

Vendor

Japan Total System Co.,ltd.

Status
Groupsession Free Edition
Groupsession Bycloud
Groupsession Zion
Vendor
CVE Published:
12 December 2025

What is CVE-2025-65120?

A reflected cross-site scripting vulnerability was identified in GroupSession products, particularly affecting the Free edition, byCloud, and ZION versions prior to 5.7.1. This vulnerability allows an attacker to embed malicious scripts in a link, which can then execute an arbitrary script in the web browser of any user who accesses the crafted URL. Proper mitigations should be implemented to protect against unauthorized script execution and maintain user data integrity.

Affected Version(s)

GroupSession byCloud prior to ver5.7.1

GroupSession Free edition prior to ver5.7.1

GroupSession ZION prior to ver5.7.1

References

https://groupsession.jp/info/info-news/security20251208
https://jvn.jp/en/jp/JVN19940619/

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

CVSS V3.0

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-65120 : Reflected Cross-Site Scripting Vulnerability in GroupSession by GroupSession Inc.