{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55210",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-16T16:16:32.627Z",
        "datePublished": "2026-09-21T21:14:31.267Z",
        "dateUpdated": "2026-09-22T13:07:10.486Z"
    },
    "containers": {
        "cna": {
            "title": "Joplin: SAML SSO account takeover via email-based account linking (missing is_external check in ssoLogin)",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-290",
                            "lang": "en",
                            "description": "CWE-290: Authentication Bypass by Spoofing",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 7.4,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5"
                },
                {
                    "name": "https://github.com/laurent22/joplin/pull/15647",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/laurent22/joplin/pull/15647"
                },
                {
                    "name": "https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2"
                }
            ],
            "affected": [
                {
                    "vendor": "laurent22",
                    "product": "joplin",
                    "versions": [
                        {
                            "version": "< 3.7.2",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-09-21T21:14:31.267Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.2, Joplin Server's UserModel.ssoLogin() returns an existing account matched by an IdP-asserted email without checking the account's is_external flag. In deployments using mixed local and SAML authentication, an attacker whose IdP session can assert a local user's email can pass POST /api/saml, receive a session for that local account, and access or modify the victim's notes, files, and settings without knowing the local password. This issue is fixed in version 3.7.2."
                }
            ],
            "source": {
                "advisory": "GHSA-5px3-4f5x-hjc5",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-22T13:06:34.047429Z",
                                "id": "CVE-2026-55210",
                                "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": "2026-09-22T13:07:10.486Z"
                }
            }
        ]
    }
}