FKIE_CVE-2025-66284
Vulnerability from fkie_nvd - Published: 2025-12-12 05:16 - Updated: 2026-06-17 09:56
Severity
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.
References
| URL | Tags | ||
|---|---|---|---|
| vultures@jpcert.or.jp | https://groupsession.jp/info/info-news/security20251208 | Vendor Advisory | |
| vultures@jpcert.or.jp | https://jvn.jp/en/jp/JVN19940619/ | Third Party Advisory |
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| groupsession | groupsession | * | |
| groupsession | groupsession | * | |
| groupsession | groupsession | * |
{
"affected": [
{
"affectedData": [
{
"product": "GroupSession Free edition",
"vendor": "Japan Total System Co.,Ltd.",
"versions": [
{
"status": "affected",
"version": "prior to ver5.7.1"
}
]
},
{
"product": "GroupSession byCloud",
"vendor": "Japan Total System Co.,Ltd.",
"versions": [
{
"status": "affected",
"version": "prior to ver5.7.1"
}
]
},
{
"product": "GroupSession ZION",
"vendor": "Japan Total System Co.,Ltd.",
"versions": [
{
"status": "affected",
"version": "prior to ver5.7.1"
}
]
}
],
"source": "vultures@jpcert.or.jp"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:bycloud:*:*:*",
"matchCriteriaId": "0023BDD1-63A1-4F4B-A949-7B5687512F86",
"versionEndExcluding": "5.7.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:*",
"matchCriteriaId": "41253C33-6699-4FE8-80B5-917FF6F71E65",
"versionEndExcluding": "5.7.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:*",
"matchCriteriaId": "428C47F8-9B26-4902-80C5-2E6A9D09B28E",
"versionEndExcluding": "5.7.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"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."
}
],
"id": "CVE-2025-66284",
"lastModified": "2026-06-17T09:56:36.597",
"metrics": {
"cvssMetricV30": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
"version": "3.0"
},
"exploitabilityScore": 2.3,
"impactScore": 2.7,
"source": "vultures@jpcert.or.jp",
"type": "Secondary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "ACTIVE",
"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",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "vultures@jpcert.or.jp",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2025-66284",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-12-12T18:43:39.814094Z",
"version": "2.0.3"
}
}
]
},
"published": "2025-12-12T05:16:12.230",
"references": [
{
"source": "vultures@jpcert.or.jp",
"tags": [
"Vendor Advisory"
],
"url": "https://groupsession.jp/info/info-news/security20251208"
},
{
"source": "vultures@jpcert.or.jp",
"tags": [
"Third Party Advisory"
],
"url": "https://jvn.jp/en/jp/JVN19940619/"
}
],
"sourceIdentifier": "vultures@jpcert.or.jp",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-79"
}
],
"source": "vultures@jpcert.or.jp",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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