CVE-2025-61987

Unknown Unknown - Not Provided

WebSocket Origin Validation Bypass in GroupSession Exposes Chat Data

Publication date: 2025-12-12

Last updated on: 2026-02-17

Assigner: JPCERT/CC

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2025-12-12

Last Modified

2026-02-17

Generated

2026-07-07

AI Q&A

2025-12-12

EPSS Evaluated

2026-07-05

NVD

CVE-2025-61987

EUVD

EUVD-2025-203021

Affected Vendors & Products

Vendor	Product	Version / Range
groupsession	groupsession	to 5.3.3 (exc)
groupsession	groupsession	to 5.3.0 (exc)
groupsession	groupsession	to 5.3.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1385	The product uses a WebSocket, but it does not properly verify that the source of data or communication is valid.

Attack-Flow Graph

Executive Summary

This vulnerability exists in GroupSession Free edition prior to version 5.3.0, GroupSession byCloud prior to version 5.3.3, and GroupSession ZION prior to version 5.3.2. The issue is that these versions do not validate origins in WebSockets. As a result, if a user accesses a crafted page, chat information sent to the user may be exposed to unauthorized parties.

Impact Analysis

The vulnerability can lead to exposure of chat information to unauthorized users if they access a specially crafted page. This could result in leakage of potentially sensitive or private chat data.

Mitigation Strategies

Users are advised to update GroupSession to the latest versions provided by the vendor to mitigate this vulnerability. [2]

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