Authorization Flaw in GroupSession Affects Memo Field Editing
CVE-2025-61950

5.3MEDIUM

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-2025-61950?

In GroupSession, a serious issue has been identified where the authorization check for creating Circular notices with a non-editable memo field is poorly implemented. As a result, a logged-in user can exploit this vulnerability to modify the memo field, which should otherwise remain unalterable. This vulnerability affects multiple versions of GroupSession, including the Free edition prior to version 5.3.0, GroupSession byCloud prior to version 5.3.3, and GroupSession ZION before version 5.3.2. It is crucial for users to upgrade to the latest versions to mitigate this risk.

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:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

CVSS V3.0

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-61950 : Authorization Flaw in GroupSession Affects Memo Field Editing