Cross-site scripting in Japan Total System Co.,Ltd. GroupSession Free edition
Priority LOW 21CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
Stored cross-site scripting vulnerabilities exist in GroupSession Free edition prior to ver5.7.1, GroupSession byCloud prior to ver5.7.1, and GroupSession ZION prior to ver5.7.1. A logged-in user can prepare a malicious page or URL, and an arbitrary script may be executed on the web browser when another user accesses it.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00173 6th 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
- No
- 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 ver5.7.1 | — | No fix listed | CNA |
| Japan Total System Co.,Ltd. | GroupSession byCloud | prior to ver5.7.1 | — | No fix listed | CNA |
| Japan Total System Co.,Ltd. | GroupSession ZION | prior to ver5.7.1 | — | No fix listed | CNA |
- GroupSession Free edition VendorJapan Total System Co.,Ltd. Affected prior to ver5.7.1 Fixed in — No fix listed CNA
- GroupSession byCloud VendorJapan Total System Co.,Ltd. Affected prior to ver5.7.1 Fixed in — No fix listed CNA
- GroupSession ZION VendorJapan Total System Co.,Ltd. Affected prior to ver5.7.1 Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:groupsession:groupsession:*:*:*:*:bycloud:*:*:* | before 5.7.1 | Vulnerable | Japan Total System Co.,Ltd. |
| cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:* | before 5.7.1 | Vulnerable | Japan Total System Co.,Ltd. |
| cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:* | before 5.7.1 | Vulnerable | Japan Total System Co.,Ltd. |
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:bycloud:*:*:* Versions before 5.7.1 Vulnerable ·Japan Total System Co.,Ltd.
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:* Versions before 5.7.1 Vulnerable ·Japan Total System Co.,Ltd.
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:* Versions before 5.7.1 Vulnerable ·Japan Total System Co.,Ltd.
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-66284
- 2026-10-03 Alias added: GHSA-gvxm-fhfx-8g6r
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-2025-38294 Authorization bypass in Japan Total System Co.,Ltd. GroupSession Free edition CVSS 4.0MEDIUM 5.3
- TI-2021-04089 Open redirect in Japan Total System Co.,Ltd. GroupSession Free edition, GroupSession… CVSS 3.1MEDIUM 6.1
Sources
- CVE-2025-66284 · CVE Program
- CVE-2025-66284 · NVD
- FIRST EPSS
- GHSA-gvxm-fhfx-8g6r · GitHub Advisory Database · CC BY 4.0
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