# CVE-2025-61987

## Summary

- **CVE ID:** CVE-2025-61987
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-1385
- **Published:** Dec 12, 2025
- **Last Modified:** Mar 12, 2026

## Description

GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2. do not validate origins in WebSockets. If a user accesses a crafted page, Chat information sent to the user may be exposed.

## Affected Products

- Japan Total System Co.,Ltd. — GroupSession Free edition (prior to ver5.3.0)
- Japan Total System Co.,Ltd. — GroupSession byCloud (prior to ver5.3.3)
- Japan Total System Co.,Ltd. — GroupSession ZION (prior to ver5.3.2)

## References

- [CNA](https://groupsession.jp/info/info-news/security20251208)
- [CNA](https://jvn.jp/en/jp/JVN19940619/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.15%
- **EPSS Percentile:** 4.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._