Medium severity5.4NVD Advisory· Published Dec 12, 2025· Updated Jun 17, 2026

CVE-2025-66284

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Japan Total System Co.,ltd./GroupSession Free editionllm-create
Range: <5.7.1
Japan Total System Co.,ltd./Groupsession Zionllm-create
Range: <5.7.1
Japan Total System Co.,ltd./Groupsession Bycloudllm-create
Range: <5.7.1
WordPress/Groupsession Zioninferred
Range: <5.7.1
Package: https://wordpress.org/plugins/groupsession-zion
Japan Total System Co.,ltd./Groupsession3 versions
cpe:2.3:a:groupsession:groupsession:*:*:*:*:bycloud:*:*:*+ 2 more
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:bycloud:*:*:*range: <5.7.1
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:*range: <5.7.1
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:*range: <5.7.1

cvss	0.351
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000

CVE-2025-66284

Description

AI Insight

Affected products

Patches

Vulnerability mechanics

References

News mentions