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Vulnerability · Published Dec 12, 2025 · Assigned by jpcert

CVE-2025-61950

Medium 4.3

In plain English

A medium-severity authorization bypass via user-controlled key in GroupSession byCloud from Japan Total System Co.,Ltd.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).

Severity (CVSS 3.0)4.3Medium
Exploit odds (30 days)0.2%top 91.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected products (as reported)

VendorProductVersions
Japan Total System Co.,Ltd. GroupSession Free edition prior to ver5.3.0
Japan Total System Co.,Ltd. GroupSession byCloud prior to ver5.3.3
Japan Total System Co.,Ltd. GroupSession ZION prior to ver5.3.2

Weakness: CWE-639 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References