{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55778",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-17T14:40:28.379Z",
        "datePublished": "2026-07-08T20:50:52.531Z",
        "dateUpdated": "2026-07-09T13:39:44.881Z"
    },
    "containers": {
        "cna": {
            "title": "Parse Server: Stored XSS via non-standard file extension bypassing file upload extension blocklist",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-434",
                            "lang": "en",
                            "description": "CWE-434: Unrestricted Upload of File with Dangerous Type",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "LOW",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "LOW",
                        "subIntegrityImpact": "LOW",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 2.1,
                        "baseSeverity": "LOW",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93"
                },
                {
                    "name": "https://github.com/parse-community/parse-server/pull/10505",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/parse-community/parse-server/pull/10505"
                },
                {
                    "name": "https://github.com/parse-community/parse-server/pull/10506",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/parse-community/parse-server/pull/10506"
                },
                {
                    "name": "https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a"
                },
                {
                    "name": "https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50"
                },
                {
                    "name": "https://github.com/parse-community/parse-server/releases/tag/8.6.81",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/parse-community/parse-server/releases/tag/8.6.81"
                },
                {
                    "name": "https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11"
                }
            ],
            "affected": [
                {
                    "vendor": "parse-community",
                    "product": "parse-server",
                    "versions": [
                        {
                            "version": ">= 9.0.0-alpha.1, < 9.9.1-alpha.11",
                            "status": "affected"
                        },
                        {
                            "version": "< 8.6.81",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-07-08T20:50:52.531Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1-alpha.11 and 8.6.81, the default fileUpload.fileExtensions blocklist could be bypassed by uploading a file with a non-standard or compound extension and dangerous content type, allowing storage adapters such as S3 and GCS to serve attacker-supplied active content and enable stored cross-site scripting. This issue is fixed in versions 9.9.1-alpha.11 and 8.6.81."
                }
            ],
            "source": {
                "advisory": "GHSA-v8x7-r927-cc93",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-07-09T13:39:32.908358Z",
                                "id": "CVE-2026-55778",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-07-09T13:39:44.881Z"
                }
            }
        ]
    }
}