CVE-2025-61950 Missing authorization in GroupSession Free edition

Medium 5.3 Published 12 Dec 2025 Updated 12 Dec 2025

A logged-in user can modify non-editable memo fields in circular notices due to improper authorization checks in GroupSession.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-61950?

CVE-2025-61950 is a medium-severity missing authorization vulnerability in Japan Total System Co.,Ltd. GroupSession Free edition, published on 12 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-639

Which versions are affected by CVE-2025-61950?

It affects 1 product.

Products include Groupsession Groupsession.

How do I fix CVE-2025-61950?

No fix has been published for CVE-2025-61950 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2025-61950 being exploited?

There is no known exploitation of CVE-2025-61950 in the wild and no public exploit code.

Sources

Also known as GHSA-gq66-gr4q-gqwp.