{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-77139",
        "assignerOrgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
        "state": "PUBLISHED",
        "assignerShortName": "TYPO3",
        "dateReserved": "2026-08-20T13:10:15.962Z",
        "datePublished": "2026-08-25T09:00:37.199Z",
        "dateUpdated": "2026-08-25T09:00:37.199Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "f4fb688c-4412-4426-b4b8-421ecf27b14a",
                "shortName": "TYPO3",
                "dateUpdated": "2026-08-25T09:00:37.199Z"
            },
            "title": "Path Traversal in extension \"Mask\" (mask)",
            "datePublic": "2026-08-25T09:00:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-22",
                            "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')",
                            "type": "CWE"
                        },
                        {
                            "lang": "en",
                            "cweId": "CWE-73",
                            "description": "CWE-73 External Control of File Name or Path",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "TYPO3",
                    "product": "Extension \"Mask\"",
                    "collectionURL": "https://packagist.org/",
                    "packageName": "mask/mask",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "9.0.0",
                            "lessThan": "9.0.11",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "8.3.12",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "The extension fails to validate a client-supplied template element key before using it to build file paths for saving and deleting Mask template files. An authenticated backend user with access to the Mask module can supply a key containing path traversal sequences to create or delete .html files outside the configured template directory.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "The extension fails to validate a client-supplied template element key before using it to build file paths for saving and deleting Mask template files. An authenticated backend user with access to the Mask module can supply a key containing path traversal sequences to create or delete <code>.html</code> files outside the configured template directory."
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://typo3.org/security/advisory/typo3-ext-sa-2026-017",
                    "tags": [
                        "vendor-advisory"
                    ]
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "HIGH",
                        "subIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "LOW",
                        "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": "MEDIUM",
                        "baseScore": 6,
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N"
                    }
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Seungbin Yang",
                    "type": "reporter"
                },
                {
                    "lang": "en",
                    "value": "Nikita Hovratov",
                    "type": "remediation developer"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "x_generator": {
                "engine": "Vulnogram 1.0.0"
            }
        }
    }
}