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GroupSession-Free-edition

In GroupSession Free edition prior to ver5.7.1, GroupSession byCloud prior to ver5.7.1, and GroupSession ZION prior to ver5.7.1, "External page display restriction" is set to "Do not limit" in the initial configuration. With this configuration, the user may be redirected to an arbitrary website when accessing a specially crafted URL.

CVE-2025-64781 is a vulnerability identified in Japan Total System Co., Ltd.'s GroupSession collaboration software, specifically in the Free edition, byCloud, and ZION versions prior to 5.7.1. The root cause is an insecure default setting where the 'External page display restriction' is configured as 'Do not limit' upon installation or initialization. This setting permits users who access a specially crafted URL to be redirected to arbitrary external websites without restriction. The vulnerability is classified under CVSS v3.0 with a score of 4.7 (medium severity), indicating that the attack vector is network-based (AV:N), requires no privileges (PR:N), but does require user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact affects integrity (I:L) but not confidentiality (C:N) or availability (A:N). Although no known exploits are currently reported in the wild, the vulnerability could be leveraged in phishing campaigns or social engineering attacks by redirecting users to malicious sites, potentially leading to further compromise. The vulnerability affects multiple GroupSession product lines, all sharing the same default insecure configuration prior to version 5.7.1. The technical details confirm the vulnerability was reserved and published in late 2025, with the Japanese CERT (jpcert) as the assigner. The lack of patch links in the provided data suggests organizations should verify updates directly from the vendor. This vulnerability highlights the risks of insecure default configurations in collaboration platforms that are often used in enterprise environments.

Detailed information about CVE-2025-64781: Initialization of a resource with an insecure default in Japan Total System Co.,Ltd. GroupSession Free edition affect

CVE-2025-64781: Initialization of a resource with an insecure default in Japan Total System Co.,Ltd. GroupSession Free edition - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-64781: Initialization of a resource with an insecure default in Japan Total System Co.,Ltd. GroupSession Free edition

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