Craft CMS 5.0.0-RC1 before 5.10.11 GraphQL Entry Mutation Site Scope Bypass

{
  "id": "ce05f11258fd08969455a58a1d01eaa17311215460aab17f099ee8883a871eb3",
  "url": "https://osv.dev/vulnerability/CVE-2026-84796",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Craft CMS 5.0.0-RC1 before 5.10.11 GraphQL Entry Mutation Site Scope Bypass",
    "summary": "Craft CMS versions before 5.10.11 contain a site scope bypass vulnerability in GraphQL entry mutation resolvers that fail to validate siteId through ArgumentManager::prepareArguments(). Attackers with tokens scoped to one site can read, modify, or delete entries across unauthorized sites by passing siteId directly in mutation arguments.",
    "evidence": "osv:CVE-2026-84796",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-84796",
      "aliases": [
        "CVE-2026-79990",
        "CVE-2026-84796",
        "GHSA-3wcr-p33w-528f"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/craftcms/cms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "04755d93f86d07cc183db47db8a0eee106892e30"
                },
                {
                  "fixed": "9dece66d9d35f9f2615f5f2107c98d2334c71cfc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.0.0-RC1"
                      },
                      {
                        "fixed": "5.10.11"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.10.11"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84796.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.855591373Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84796.json",
        "https://github.com/craftcms/cms/security/advisories/GHSA-3wcr-p33w-528f",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-84796",
        "https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.11-graphql-entry-mutation-site-scope-bypass"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84796.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-79990",
        "evidence": "/aliases"
      },
      {
        "value": "CVE-2026-84796",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518458,
  "published_at": "2026-09-02T11:11:12.215+00:00"
}