CVE-2025-66284

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.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector : AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Exploitability : 2.3 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://groupsession.jp/info/info-news/security20251208	Vendor Advisory
https://jvn.jp/en/jp/JVN19940619/	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:groupsession:groupsession:::::bycloud:::*
	cpe:2.3:a:groupsession:groupsession:::::free:::*
	cpe:2.3:a:groupsession:groupsession:::::zion:::*

History

17 Feb 2026, 15:07

Type	Values Removed	Values Added
First Time		Groupsession Groupsession groupsession
References	~~() https://groupsession.jp/info/info-news/security20251208 -~~	() https://groupsession.jp/info/info-news/security20251208 - Vendor Advisory
References	~~() https://jvn.jp/en/jp/JVN19940619/ -~~	() https://jvn.jp/en/jp/JVN19940619/ - Third Party Advisory
CPE		cpe:2.3:a:groupsession:groupsession:::::free:::* cpe:2.3:a:groupsession:groupsession:::::zion:::* cpe:2.3:a:groupsession:groupsession:::::bycloud:::*

12 Dec 2025, 05:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-12-12 05:16

Updated : 2026-02-17 15:07

NVD link : CVE-2025-66284

Mitre link : CVE-2025-66284

CVE.ORG link : CVE-2025-66284

JSON object : View

Products Affected

groupsession

groupsession

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

{"id": "CVE-2025-66284", "cveTags": [], "metrics": {"cvssMetricV30": [{"type": "Secondary", "source": "vultures@jpcert.or.jp", "cvssData": {"scope": "CHANGED", "version": "3.0", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.3}], "cvssMetricV40": [{"type": "Secondary", "source": "vultures@jpcert.or.jp", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 4.8, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2025-12-12T05:16:12.230", "references": [{"url": "https://groupsession.jp/info/info-news/security20251208", "tags": ["Vendor Advisory"], "source": "vultures@jpcert.or.jp"}, {"url": "https://jvn.jp/en/jp/JVN19940619/", "tags": ["Third Party Advisory"], "source": "vultures@jpcert.or.jp"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "vultures@jpcert.or.jp", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-02-17T15:07:21.693", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:bycloud:*:*:*", "vulnerable": true, "matchCriteriaId": "0023BDD1-63A1-4F4B-A949-7B5687512F86", "versionEndExcluding": "5.7.1"}, {"criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:*", "vulnerable": true, "matchCriteriaId": "41253C33-6699-4FE8-80B5-917FF6F71E65", "versionEndExcluding": "5.7.1"}, {"criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:*", "vulnerable": true, "matchCriteriaId": "428C47F8-9B26-4902-80C5-2E6A9D09B28E", "versionEndExcluding": "5.7.1"}], "operator": "OR"}]}], "sourceIdentifier": "vultures@jpcert.or.jp"}