{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-27804",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-02-24T02:31:33.266Z",
        "datePublished": "2026-02-25T23:48:20.858Z",
        "dateUpdated": "2026-02-26T17:03:50.903Z"
    },
    "containers": {
        "cna": {
            "title": "Parse Server: Account takeover via JWT algorithm confusion in Google auth adapter",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-327",
                            "lang": "en",
                            "description": "CWE-327: Use of a Broken or Risky Cryptographic Algorithm",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-345",
                            "lang": "en",
                            "description": "CWE-345: Insufficient Verification of Data Authenticity",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 9.3,
                        "baseSeverity": "CRITICAL",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/parse-community/parse-server/security/advisories/GHSA-4q3h-vp4r-prv2",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-4q3h-vp4r-prv2"
                },
                {
                    "name": "https://github.com/parse-community/parse-server/commit/9b94083accb7f3e72c6b8126c195c7a03dd2dfd7",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/parse-community/parse-server/commit/9b94083accb7f3e72c6b8126c195c7a03dd2dfd7"
                },
                {
                    "name": "https://github.com/parse-community/parse-server/commit/9d5942d50e55c822924c27b05aa98f1393e7a330",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/parse-community/parse-server/commit/9d5942d50e55c822924c27b05aa98f1393e7a330"
                },
                {
                    "name": "https://github.com/parse-community/parse-server/releases/tag/8.6.3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/parse-community/parse-server/releases/tag/8.6.3"
                },
                {
                    "name": "https://github.com/parse-community/parse-server/releases/tag/9.3.1-alpha.4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/parse-community/parse-server/releases/tag/9.3.1-alpha.4"
                }
            ],
            "affected": [
                {
                    "vendor": "parse-community",
                    "product": "parse-server",
                    "versions": [
                        {
                            "version": ">= 9.0.0, < 9.3.1-alpha.4",
                            "status": "affected"
                        },
                        {
                            "version": "< 8.6.3",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-02-25T23:48:20.858Z"
            },
            "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 versions 8.6.3 and 9.1.1-alpha.4, an unauthenticated attacker can forge a Google authentication token with `alg: \"none\"` to log in as any user linked to a Google account, without knowing their credentials. All deployments with Google authentication enabled are affected. The fix in versions 8.6.3 and 9.1.1-alpha.4 hardcodes the expected `RS256` algorithm instead of trusting the JWT header, and replaces the Google adapter's custom key fetcher with `jwks-rsa` which rejects unknown key IDs. As a workaround, dsable Google authentication until upgrading is possible."
                }
            ],
            "source": {
                "advisory": "GHSA-4q3h-vp4r-prv2",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-02-26T17:03:17.987949Z",
                                "id": "CVE-2026-27804",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "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": "2026-02-26T17:03:50.903Z"
                }
            }
        ]
    }
}