{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-104890",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-02T14:59:11.775Z",
        "datePublished": "2026-10-05T15:46:21.959Z",
        "dateUpdated": "2026-10-07T20:50:50.492Z"
    },
    "containers": {
        "cna": {
            "title": "Kunstmaan CMS: MediaBundle extension blacklist bypass allows authenticated administrators to upload executable PHP files leading to remote code execution",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-434",
                            "lang": "en",
                            "description": "CWE-434: Unrestricted Upload of File with Dangerous Type",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 7.2,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "HIGH",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/security/advisories/GHSA-p279-5wcv-45vq",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/security/advisories/GHSA-p279-5wcv-45vq"
                },
                {
                    "name": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/commit/1bbdfdeac8e7e91506b1a9271360b9b68d7690d3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/commit/1bbdfdeac8e7e91506b1a9271360b9b68d7690d3"
                },
                {
                    "name": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/releases/tag/7.3.2",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/Kunstmaan/KunstmaanBundlesCMS/releases/tag/7.3.2"
                }
            ],
            "affected": [
                {
                    "vendor": "Kunstmaan",
                    "product": "KunstmaanBundlesCMS",
                    "versions": [
                        {
                            "version": "< 7.3.1",
                            "status": "affected"
                        }
                    ]
                },
                {
                    "vendor": "kunstmaan",
                    "product": "bundles-cms",
                    "versions": [
                        {
                            "version": "< 7.3.1",
                            "status": "affected"
                        }
                    ]
                },
                {
                    "vendor": "kunstmaan",
                    "product": "media-bundle",
                    "versions": [
                        {
                            "version": "< 7.3.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-05T15:46:21.959Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Kunstmaan CMS is an open source content management system based on the Symfony framework. Prior to 7.3.2, src/Kunstmaan/MediaBundle/Helper/File/FileHandler.php performs the blacklisted_extensions check case-sensitively in FileHandler::getFilePath and lowercases the stored extension afterward. An authenticated backend user with media access can upload a mixed-case executable extension such as PHP that bypasses the check and is stored in the web-accessible media directory with an executable lowercase extension. The default blacklist also omits several server-executable extension types, allowing the same code-execution impact where the web server executes uploaded files. This issue is fixed in version 7.3.2."
                }
            ],
            "source": {
                "advisory": "GHSA-p279-5wcv-45vq",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-07T20:50:41.475759Z",
                                "id": "CVE-2026-104890",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-10-07T20:50:50.492Z"
                }
            }
        ]
    }
}