---
id: CVE-2025-61987
title: >-
  GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to
  ver5.3.3, and GroupSession ZION prior to ver5.3.2
summary: >-
  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…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-1385
vendor: groupsession
product: groupsession
affected:
  - groupsession < 5.3.0
  - groupsession < 5.3.2
  - groupsession < 5.3.3
patched:
  - groupsession 5.3.3
published: '2025-12-12'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T20:10:01.970'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-61987'
references:
  - url: 'https://groupsession.jp/info/info-news/security20251208'
    label: vultures@jpcert.or.jp
  - url: 'https://jvn.jp/en/jp/JVN19940619/'
    label: vultures@jpcert.or.jp
tags:
  - nvd
epss: 0.00151
epssPercentile: 0.03653
ingestedAt: '2026-10-07T20:46:46.891Z'
---

## Overview

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

- `groupsession < 5.3.0`
- `groupsession < 5.3.2`
- `groupsession < 5.3.3`

## Remediation

Upgrade past the affected range:

- `groupsession 5.3.3`