{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-105639",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-05T16:40:39.612Z",
        "datePublished": "2026-10-05T18:10:35.787Z",
        "dateUpdated": "2026-10-06T14:52:44.084Z"
    },
    "containers": {
        "cna": {
            "title": "Plane: Pre-auth workspace invitation hijack via email-squat and self-served invitation token leak in Plane",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-200",
                            "lang": "en",
                            "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-287",
                            "lang": "en",
                            "description": "CWE-287: Improper Authentication",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-639",
                            "lang": "en",
                            "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 9.8,
                        "baseSeverity": "CRITICAL",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/makeplane/plane/security/advisories/GHSA-4vj8-p63v-8p24",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/makeplane/plane/security/advisories/GHSA-4vj8-p63v-8p24"
                },
                {
                    "name": "https://github.com/makeplane/plane/pull/9297",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/makeplane/plane/pull/9297"
                },
                {
                    "name": "https://github.com/makeplane/plane/commit/6220ba990b2276a1a1979d1d5df68f650b8b47ad",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/makeplane/plane/commit/6220ba990b2276a1a1979d1d5df68f650b8b47ad"
                },
                {
                    "name": "https://github.com/makeplane/plane/releases/tag/v1.4.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/makeplane/plane/releases/tag/v1.4.0"
                }
            ],
            "affected": [
                {
                    "vendor": "makeplane",
                    "product": "plane",
                    "versions": [
                        {
                            "version": "< 1.4.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-05T18:10:35.787Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Plane is an open-source project management tool. Prior to 1.4.0, Plane's signup flow creates a logged-in User row for any submitted email without an out-of-band ownership check, while User.email is unique=True. The authenticated user can call GET /api/users/me/workspaces/invitations/, which returns each WorkspaceMemberInvite whose email matches request.user.email. WorkSpaceMemberInviteSerializer uses fields = \"all\", exposing the token that protects the invitation join endpoint. An unauthenticated attacker who knows a target's email can register an account using that address, enumerate pending invitations, and accept an invitation as the target, joining a workspace at the invited role. The term pre-auth describes the attacker's initial state: the attacker has no credential before signup, while the enumeration and join requests use the session created by that signup. This issue is fixed in 1.4.0."
                }
            ],
            "source": {
                "advisory": "GHSA-4vj8-p63v-8p24",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-06T14:37:11.181590Z",
                                "id": "CVE-2026-105639",
                                "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": "2026-10-06T14:52:44.084Z"
                }
            }
        ]
    }
}