{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55066",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-16T14:33:35.710Z",
        "datePublished": "2026-08-28T16:51:48.114Z",
        "dateUpdated": "2026-08-28T16:51:48.114Z"
    },
    "containers": {
        "cna": {
            "title": "Vikunja: Cross-tenant IDOR in kanban move-task endpoint via unauthorized body task_id",
            "problemTypes": [
                {
                    "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": "NONE",
                        "baseScore": 7.1,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "LOW",
                        "privilegesRequired": "LOW",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-5pg6-m483-7vrg",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-5pg6-m483-7vrg"
                },
                {
                    "name": "https://github.com/go-vikunja/vikunja/pull/3239",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/go-vikunja/vikunja/pull/3239"
                },
                {
                    "name": "https://github.com/go-vikunja/vikunja/commit/36cdc2ce2be0b8ccc74227d178b92047d59cd65f",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/go-vikunja/vikunja/commit/36cdc2ce2be0b8ccc74227d178b92047d59cd65f"
                },
                {
                    "name": "https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0"
                }
            ],
            "affected": [
                {
                    "vendor": "go-vikunja",
                    "product": "vikunja",
                    "versions": [
                        {
                            "version": "< 2.4.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-28T16:51:48.114Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Vikunja is an open-source self-hosted task management platform. Prior to 2.4.0, POST /api/v1/projects/{project}/views/{view}/buckets/{bucket}/tasks accepts a body supplied task_id but TaskBucket.CanUpdate in pkg/models/kanban_task_bucket.go authorizes only the project, view, and bucket from the URL. updateTaskBucket then calls Task.ReadOne without a separate task permission check, returns the victim task contents, and can update the task done state when the attacker chooses a done bucket. Because task identifiers are global sequential values, an authenticated user can enumerate cross-tenant tasks and modify their completion metadata through both the v1 and v2 routes that share this model. This issue is fixed in version 2.4.0."
                }
            ],
            "source": {
                "advisory": "GHSA-5pg6-m483-7vrg",
                "discovery": "UNKNOWN"
            }
        }
    }
}