Reflected Cross-Site Scripting in GroupSession by byCloud
CVE-2025-57883

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-2025-57883?

A reflected cross-site scripting vulnerability exists in several versions of GroupSession, including the Free edition, byCloud, and ZION. When users navigate to a specially crafted page or URL, this vulnerability allows an attacker to execute arbitrary scripts within the user's web browser. Such exploits can lead to the theft of sensitive information and other malicious actions, emphasizing the need for prompt updates to the latest secured versions of the product.

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Affected Version(s)

GroupSession byCloud prior to ver5.3.3

GroupSession Free edition prior to ver5.3.0

GroupSession ZION prior to ver5.3.2

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

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