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.
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Meta Information
Published
2025-12-12
Last Modified
2026-02-17
Generated
2026-06-16
AI Q&A
2025-12-12
EPSS Evaluated
2026-06-15
NVD
CVE-2025-61987
EUVD
EUVD-2025-203021
Affected Vendors & Products
Showing 3 associated CPEs
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
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KEV
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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.
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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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