Vulnerability Instance

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{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/71448?format=api",
    "vulnerability_id": "VCID-42ec-2ca6-yyac",
    "summary": "Umbraco is an ASP.NET CMS. From 16.2.0 to before 16.5.1 and 17.2.2, An authenticated backoffice user with access to Settings can inject malicious HTML into property type descriptions. Due to an overly permissive attributeNameCheck configuration (/.+/) in the UFM DOMPurify instance, event handler attributes such as onclick and onload, when used within Umbraco web components (umb-*, uui-*, ufm-*) were not filtered. This vulnerability is fixed in 16.5.1 and 17.2.2.",
    "aliases": [
        {
            "alias": "CVE-2026-31833"
        },
        {
            "alias": "GHSA-vrqc-59mw-qqg7"
        }
    ],
    "fixed_packages": [],
    "affected_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/40697?format=api",
            "purl": "pkg:nuget/Umbraco.Cms@16.2.0",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-42ec-2ca6-yyac"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:nuget/Umbraco.Cms@16.2.0"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/40669?format=api",
            "purl": "pkg:nuget/Umbraco.Cms@17.0.0",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-42ec-2ca6-yyac"
                },
                {
                    "vulnerability": "VCID-8sxm-wy99-cbeh"
                },
                {
                    "vulnerability": "VCID-zm2x-n2ju-5qdp"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:nuget/Umbraco.Cms@17.0.0"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/397015?format=api",
            "purl": "pkg:nuget/Umbraco.CMS@16.2.0",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-42ec-2ca6-yyac"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:nuget/Umbraco.CMS@16.2.0"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/397016?format=api",
            "purl": "pkg:nuget/Umbraco.CMS@17.0.0",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-42ec-2ca6-yyac"
                },
                {
                    "vulnerability": "VCID-8sxm-wy99-cbeh"
                },
                {
                    "vulnerability": "VCID-zm2x-n2ju-5qdp"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:nuget/Umbraco.CMS@17.0.0"
        }
    ],
    "references": [
        {
            "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2026-31833",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "0.00066",
                    "scoring_system": "epss",
                    "scoring_elements": "0.20642",
                    "published_at": "2026-06-11T12:55:00Z"
                },
                {
                    "value": "0.00066",
                    "scoring_system": "epss",
                    "scoring_elements": "0.20815",
                    "published_at": "2026-06-14T12:55:00Z"
                },
                {
                    "value": "0.00066",
                    "scoring_system": "epss",
                    "scoring_elements": "0.20837",
                    "published_at": "2026-06-13T12:55:00Z"
                },
                {
                    "value": "0.00066",
                    "scoring_system": "epss",
                    "scoring_elements": "0.20817",
                    "published_at": "2026-06-12T12:55:00Z"
                }
            ],
            "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-31833"
        },
        {
            "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31833",
            "reference_id": "CVE-2026-31833",
            "reference_type": "",
            "scores": [
                {
                    "value": "6.7",
                    "scoring_system": "cvssv3.1",
                    "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L"
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31833"
        },
        {
            "reference_url": "https://github.com/advisories/GHSA-vrqc-59mw-qqg7",
            "reference_id": "GHSA-vrqc-59mw-qqg7",
            "reference_type": "",
            "scores": [
                {
                    "value": "MODERATE",
                    "scoring_system": "cvssv3.1_qr",
                    "scoring_elements": ""
                }
            ],
            "url": "https://github.com/advisories/GHSA-vrqc-59mw-qqg7"
        },
        {
            "reference_url": "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-vrqc-59mw-qqg7",
            "reference_id": "GHSA-vrqc-59mw-qqg7",
            "reference_type": "",
            "scores": [
                {
                    "value": "6.7",
                    "scoring_system": "cvssv3.1",
                    "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L"
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "cvssv3.1_qr",
                    "scoring_elements": ""
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                },
                {
                    "value": "Track",
                    "scoring_system": "ssvc",
                    "scoring_elements": "SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-03-11T15:52:31Z/"
                }
            ],
            "url": "https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-vrqc-59mw-qqg7"
        }
    ],
    "weaknesses": [
        {
            "cwe_id": 79,
            "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
            "description": "The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users."
        },
        {
            "cwe_id": 937,
            "name": "OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities",
            "description": "Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2013."
        },
        {
            "cwe_id": 1035,
            "name": "OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities",
            "description": "Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2017."
        }
    ],
    "exploits": [],
    "severity_range_score": "4.0 - 6.9",
    "exploitability": "0.5",
    "weighted_severity": "6.2",
    "risk_score": 3.1,
    "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-42ec-2ca6-yyac"
}