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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-8239",
"assignerOrgId": "ff5b8ace-8b95-4078-9743-eac1ca5451de",
"state": "PUBLISHED",
"assignerShortName": "ConcreteCMS",
"dateReserved": "2026-05-09T16:01:16.574Z",
"datePublished": "2026-05-21T21:00:52.541Z",
"dateUpdated": "2026-05-22T12:29:59.743Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "ff5b8ace-8b95-4078-9743-eac1ca5451de",
"shortName": "ConcreteCMS",
"dateUpdated": "2026-05-21T21:00:52.541Z"
},
"title": "Concrete CMS 9.5.0 and below is vulnerable to IDOR in '/ccm/frontend/conversations/get_rating'",
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"cweId": "CWE-862",
"description": "CWE-862",
"type": "CWE"
}
]
}
],
"impacts": [
{
"capecId": "CAPEC-122",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-122 Privilege Abuse"
}
]
}
],
"affected": [
{
"vendor": "Concrete CMS",
"product": "Concrete CMS",
"collectionURL": "https://github.com/concretecms/concretecms",
"repo": "https://github.com/concretecms/concretecms",
"versions": [
{
"status": "affected",
"version": "5.0",
"lessThanOrEqual": "9.5.0",
"versionType": "git"
}
],
"defaultStatus": "unaffected"
}
],
"descriptions": [
{
"lang": "en",
"value": "Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/get_rating' endpoint confirms existence and returns rating score for any message by ID. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Tristan Madani for reporting.",
"supportingMedia": [
{
"type": "text/html",
"base64": false,
"value": "Concrete CMS 9.5.0 and below is vulnerable to IDOR.&nbsp;<span>The&nbsp;</span>'/ccm/frontend/conversations/get_rating'<span>&nbsp;endpoint c</span><span>onfirms existence and returns rating score for any message by ID.&nbsp;</span>The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of&nbsp;6.3 with Vector&nbsp;CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Tristan Madani for reporting.&nbsp;"
}
]
}
],
"references": [
{
"url": "https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes",
"tags": [
"release-notes"
]
}
],
"metrics": [
{
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
],
"cvssV4_0": {
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "LOW",
"subConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"subIntegrityImpact": "NONE",
"vulnAvailabilityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED",
"version": "4.0",
"baseSeverity": "MEDIUM",
"baseScore": 6.3,
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
}
}
],
"credits": [
{
"lang": "en",
"value": "Tristan Madani",
"type": "finder"
}
],
"source": {
"defect": [
"HackerOne"
],
"advisory": "https://hackerone.com/reports/3611476",
"discovery": "EXTERNAL"
},
"x_generator": {
"engine": "Vulnogram 1.0.2"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-05-22T12:29:48.679413Z",
"id": "CVE-2026-8239",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-05-22T12:29:59.743Z"
}
}
]
}
}