Authorization bypass in Japan Total System Co.,Ltd. GroupSession Free edition
Priority LOW 29CWE-639Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00189 8th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Japan Total System Co.,Ltd. | GroupSession Free edition | prior to ver5.3.0 | — | No fix listed | CNA |
| Japan Total System Co.,Ltd. | GroupSession byCloud | prior to ver5.3.3 | — | No fix listed | CNA |
| Japan Total System Co.,Ltd. | GroupSession ZION | prior to ver5.3.2 | — | No fix listed | CNA |
- GroupSession Free edition VendorJapan Total System Co.,Ltd. Affected prior to ver5.3.0 Fixed in — No fix listed CNA
- GroupSession byCloud VendorJapan Total System Co.,Ltd. Affected prior to ver5.3.3 Fixed in — No fix listed CNA
- GroupSession ZION VendorJapan Total System Co.,Ltd. Affected prior to ver5.3.2 Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:* | before 5.3.0 | Vulnerable | Japan Total System Co.,Ltd. |
| cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:* | before 5.3.2 | Vulnerable | Japan Total System Co.,Ltd. |
| cpe:2.3:a:groupsession:groupsession:*:*:*:*:bycloud:*:*:* | before 5.3.3 | Vulnerable | Japan Total System Co.,Ltd. |
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:* Versions before 5.3.0 Vulnerable ·Japan Total System Co.,Ltd.
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:* Versions before 5.3.2 Vulnerable ·Japan Total System Co.,Ltd.
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:bycloud:*:*:* Versions before 5.3.3 Vulnerable ·Japan Total System Co.,Ltd.
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-61950
- 2026-10-03 Alias added: GHSA-gq66-gr4q-gqwp
References
More Japan Total System Co.,Ltd. Groupsession vulnerabilities
- TI-2021-04088 Incorrect permission assignment in Japan Total System Co.,Ltd. GroupSession Free edition… CVSS 3.1HIGH 7.5
- TI-2025-38316 GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and… CVSS 4.0MEDIUM 6.9
- TI-2021-04090 Path traversal in Japan Total System Co.,Ltd. GroupSession Free edition, GroupSession… CVSS 3.1MEDIUM 6.8
- TI-2017-01466 Information disclosure in Japan Total System Co.,Ltd. GroupSession CVSS 3.0MEDIUM 6.5
- TI-2021-04089 Open redirect in Japan Total System Co.,Ltd. GroupSession Free edition, GroupSession… CVSS 3.1MEDIUM 6.1
- TI-2021-04015 Open redirect in Japan Total System Co.,Ltd. GroupSession CVSS 3.1MEDIUM 6.1
Sources
- CVE-2025-61950 · CVE Program
- CVE-2025-61950 · NVD
- FIRST EPSS
- GHSA-gq66-gr4q-gqwp · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences