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    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-7890",
        "assignerOrgId": "ff5b8ace-8b95-4078-9743-eac1ca5451de",
        "state": "PUBLISHED",
        "assignerShortName": "ConcreteCMS",
        "dateReserved": "2026-05-05T20:53:35.093Z",
        "datePublished": "2026-05-21T21:43:44.845Z",
        "dateUpdated": "2026-05-22T12:54:45.612Z"
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                "shortName": "ConcreteCMS",
                "dateUpdated": "2026-05-21T21:43:44.845Z"
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            "title": "Concrete CMS 9.5.0 is vulnerable to SSRF via RSS Displayer Block",
            "problemTypes": [
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                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-918",
                            "description": "CWE-918 Server-Side request forgery (SSRF)",
                            "type": "CWE"
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            ],
            "impacts": [
                {
                    "capecId": "CAPEC-664",
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                            "lang": "en",
                            "value": "CAPEC-664 Server Side Request Forgery"
                        }
                    ]
                }
            ],
            "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"
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                    "lang": "en",
                    "value": "In Concrete CMS 9.5.0 and below, the RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation enabling redirect-to-internal bypasses.  The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.1 with a vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N.",
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                    ]
                }
            ],
            "references": [
                {
                    "url": "https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes",
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                        "release-notes"
                    ]
                }
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                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "HIGH",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "subConfidentialityImpact": "LOW",
                        "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": 2.1,
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N"
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                "discovery": "EXTERNAL"
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        "adp": [
            {
                "metrics": [
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                                "timestamp": "2026-05-22T12:54:38.026772Z",
                                "id": "CVE-2026-7890",
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                                        "Exploitation": "none"
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