{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-8340",
        "assignerOrgId": "ff5b8ace-8b95-4078-9743-eac1ca5451de",
        "state": "PUBLISHED",
        "assignerShortName": "ConcreteCMS",
        "dateReserved": "2026-05-11T16:05:50.640Z",
        "datePublished": "2026-05-22T13:58:55.844Z",
        "dateUpdated": "2026-05-22T17:26:12.832Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "ff5b8ace-8b95-4078-9743-eac1ca5451de",
                "shortName": "ConcreteCMS",
                "dateUpdated": "2026-05-22T13:58:55.844Z"
            },
            "title": "Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\\File::approveVersion",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-352",
                            "description": "CWE-352 Cross-Site request forgery (CSRF)",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-62",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-62 Cross Site Request Forgery"
                        }
                    ]
                },
                {
                    "capecId": "CAPEC-60",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-60 Reusing Session IDs (aka Session Replay)"
                        }
                    ]
                }
            ],
            "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 CSRF via Backend\\File::approveVersion. Victim with edit_file_contents permission is CSRF'd into publishing an attacker-chosen previously-uploaded version (downgrade to an older version of a file, or activation of a co-editor's unpublished version). The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "<div><span>Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\\File::approveVersion.&nbsp;</span><span>Victim with&nbsp;</span><code>edit_file_contents</code><span>&nbsp;</span><span>permission is CSRF'd into publishing an attacker-chosen previously-uploaded version (downgrade to an older version of a file, or activation of a co-editor's unpublished version).&nbsp;</span><span>The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector&nbsp;CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.&nbsp;</span></div>"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes",
                    "tags": [
                        "release-notes"
                    ]
                }
            ],
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                            "lang": "en",
                            "value": "GENERAL"
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                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "LOW",
                        "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": "LOW",
                        "baseScore": 2.3,
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
                    }
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Winston Crooker",
                    "type": "finder"
                }
            ],
            "source": {
                "defect": [
                    "HackerOne"
                ],
                "advisory": "https://hackerone.com/reports/3682856",
                "discovery": "UNKNOWN"
            },
            "x_generator": {
                "engine": "Vulnogram 1.0.2"
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        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-05-22T17:25:35.635711Z",
                                "id": "CVE-2026-8340",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
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                                        "Automatable": "no"
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                                        "Technical Impact": "partial"
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                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
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}