CVE-2025-61950
Unknown Unknown - Not Provided
Improper Authorization Allows Memo Modification in GroupSession

Publication date: 2025-12-12

Last updated on: 2026-02-17

Assigner: JPCERT/CC

Description
In GroupSession, a Circular notice can be created with its memo field non-editable, but the authorization check is improperly implemented. With some crafted request, a logged-in user may alter the memo field. The affected products and versions are GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2.
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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
2026-06-14
NVD
CVE-2025-61950
EUVD
EUVD-2025-203022
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-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
Attack-Flow Graph
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Mitigation Strategies

To mitigate this vulnerability, update GroupSession to the latest versions: GroupSession Free edition to version 5.3.0 or later, GroupSession byCloud to version 5.3.3 or later, and GroupSession ZION to version 5.3.2 or later. [2]

Executive Summary

This vulnerability in GroupSession allows a logged-in user to alter the memo field of a Circular notice, which is supposed to be non-editable. The authorization check for editing the memo field is improperly implemented, enabling modification through a crafted request. It affects 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.

Impact Analysis

The vulnerability can impact you by allowing unauthorized modification of the memo field in Circular notices within GroupSession. This could lead to integrity issues, where information in the memo field is altered without proper authorization, potentially causing misinformation or misuse of the system's notice functionality.

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