{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-30662", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-03-24T18:49:37.326Z", "dateReserved": "2026-03-04T00:00:00.000Z", "datePublished": "2026-03-24T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-03-24T14:19:16.045Z"}, "descriptions": [{"lang": "en", "value": "ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component. The 'download' method in 'concrete/controllers/backend/file.php' improperly manages memory when creating zip archives. It uses 'ZipArchive::addFromString' combined with 'file_get_contents', which loads the entire content of every selected file into PHP memory. An authenticated attacker can exploit this by requesting a bulk download of large files, triggering an Out-Of-Memory (OOM) condition that causes the PHP-FPM process to terminate (SIGSEGV) and the web server to return a 500 error."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://wang1rrr.github.io/2026/02/11/CVE-Report-ConcreteCMS-DoS/"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-400", "lang": "en", "description": "CWE-400 Uncontrolled Resource Consumption"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-03-24T18:49:15.519526Z", "id": "CVE-2026-30662", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"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": "2026-03-24T18:49:37.326Z"}}]}, "dataVersion": "5.2"}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:concretecms:concrete_cms:9.4.7:*:*:*:*:*:*:*", "matchCriteriaId": "EF06110B-22B0-44D9-951B-BBB115E0968D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component. The 'download' method in 'concrete/controllers/backend/file.php' improperly manages memory when creating zip archives. It uses 'ZipArchive::addFromString' combined with 'file_get_contents', which loads the entire content of every selected file into PHP memory. An authenticated attacker can exploit this by requesting a bulk download of large files, triggering an Out-Of-Memory (OOM) condition that causes the PHP-FPM process to terminate (SIGSEGV) and the web server to return a 500 error."}], "id": "CVE-2026-30662", "lastModified": "2026-03-24T20:16:27.010", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-03-24T15:16:34.457", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://wang1rrr.github.io/2026/02/11/CVE-Report-ConcreteCMS-DoS/"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-400"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "9.4.7"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "concrete_cms", "vendor": "concretecms"}], "analysis": {"en": {"generated_at": "2026-03-24T21:27:56.792058+00:00", "value": {"mitigation_remediation": ["Upgrade ConcreteCMS to version 9.4.8 or later", "If an upgrade cannot be performed immediately, disable or restrict the bulk\u2011download feature to prevent creation of large ZIP archives", "Monitor PHP\u2011FPM for crashes and implement high\u2011availability or redundancy to mitigate downtime"], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Only the 9.4.7 release of ConcreteCMS that has the File Manager bulk\u2011download feature enabled is affected. The issue resides in concrete/controllers/backend/file.php and does not apply to newer releases where the zip creation process has been patched or constrained.", "description_and_impact": "ConcreteCMS version 9.4.7 contains a denial\u2011of\u2011service vulnerability in the File Manager\u2019s bulk download function. The controller uses ZipArchive::addFromString combined with file_get_contents, loading each selected file into PHP memory; this flaw is identified as a CWE\u2011400 memory management weakness. When an attacker selects large files for download, PHP\u2011FPM exhausts memory, crashes with a SIGSEGV, and the web server returns a 500 error, disrupting service for all users.", "risk_and_exploitability": "The CVSS score of 6.5 signals a medium severity. No EPSS score is available and the flaw is not yet recorded in CISA\u2019s KEV catalog. Exploitation requires authenticated access; an attacker who can log in to the CMS can trigger the OOM by initiating a bulk download of large files. The attack does not compromise confidentiality or integrity, but it can cause temporary availability outages until the PHP process restarts or the server is recovered."}}}}, "created": "2026-03-25T11:49:01.041259+00:00", "title": "ConcreteCMS Bulk Download OOM Denial of Service", "updated": "2026-03-25T20:40:51.469749+00:00", "vendors": ["concretecms", "concretecms$PRODUCT$concrete_cms"]}