{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-45286",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-05-11T20:14:43.200Z",
        "datePublished": "2026-06-01T16:59:36.865Z",
        "dateUpdated": "2026-06-01T19:13:25.363Z"
    },
    "containers": {
        "cna": {
            "title": "Nextcloud: Calendar app leaked user identifiers via attendee suggestion endpoint",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-200",
                            "lang": "en",
                            "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 4.3,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "LOW",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r697-74m9-gvf2",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r697-74m9-gvf2"
                },
                {
                    "name": "https://github.com/nextcloud/calendar/issues/7971",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/nextcloud/calendar/issues/7971"
                },
                {
                    "name": "https://github.com/nextcloud/calendar/pull/8197",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/nextcloud/calendar/pull/8197"
                },
                {
                    "name": "https://hackerone.com/reports/3540663",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://hackerone.com/reports/3540663"
                }
            ],
            "affected": [
                {
                    "vendor": "nextcloud",
                    "product": "security-advisories",
                    "versions": [
                        {
                            "version": ">= 5.5.13, < 5.5.17",
                            "status": "affected"
                        },
                        {
                            "version": ">= 6.2.0, < 6.2.3",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-06-01T16:59:36.865Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Nextcloud is an open source content collaboration platform. From versions 5.5.13 to before 5.5.17, and 6.2.0 to before 6.2.3, an authenticated user can enumerate users on the same Nextcloud instance by using the Calendar app's endpoint for suggesting attendees. The sharing restrictions, applied to other endpoints, were not effective here. This issue has been patched in versions 5.5.17 and 6.2.3."
                }
            ],
            "source": {
                "advisory": "GHSA-r697-74m9-gvf2",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-06-01T19:12:56.174122Z",
                                "id": "CVE-2026-45286",
                                "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": "2026-06-01T19:13:25.363Z"
                }
            }
        ]
    }
}