django CMS: Missing authorization in `render_object_structure` discloses non-PageContent placeholder structure to low-privileged staff

{
  "id": "777a1148cf45b3390893904b26875d302bc0c25661d90dfa8c50d024e8165ba9",
  "url": "https://osv.dev/vulnerability/CVE-2026-61663",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "django CMS: Missing authorization in `render_object_structure` discloses non-PageContent placeholder structure to low-privileged staff",
    "summary": "django CMS is an easy-to-use and developer-friendly enterprise content management system powered by Django. Prior to 5.0.9, render_object_structure fails to authorize non-PageContent objects that use PlaceholderRelationField. An active staff user without cms.use_structure or model-level view or change permission can request the //admin/cms/placeholder/object//structure// endpoint with guessed content_type_id and object_id values. The response discloses placeholder slot names, plugin trees, plugin identifiers, labels, and object existence for frontend-editable objects. The fix applies user_can_view_placeholder_source to the non-PageContent branch while keeping the structure board read-only for view-only users. This issue is fixed in versions 5.0.9.",
    "evidence": "osv:CVE-2026-61663",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-61663",
      "aliases": [
        "CVE-2026-61663",
        "GHSA-8qj2-c6q4-f399",
        "PYSEC-2026-3823"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/django-cms/django-cms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "d7eeb6526bd757cfcdf28122066f39803990c5e4"
                },
                {
                  "fixed": "9c82abfeb25471583e23906ea1ebef9202527b04"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.0.9"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9c82abfeb25471583e23906ea1ebef9202527b04"
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                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d7eeb6526bd757cfcdf28122066f39803990c5e4"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "5.0.9"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.0.8",
            "5.0.7",
            "5.0.6",
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            "3.2.0.rc1",
            "2.3.4",
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            "3.0",
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            "3.0.0.beta3",
            "3.0.0.beta2",
            "3.0.0.beta",
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            "2.1.0.rc3",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61663.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.663739731Z",
      "provider": "osv",
      "references": [
        "https://github.com/django-cms/django-cms/releases/tag/5.0.9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61663.json",
        "https://github.com/django-cms/django-cms/security/advisories/GHSA-8qj2-c6q4-f399",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-61663",
        "https://github.com/django-cms/django-cms/commit/9c82abfeb25471583e23906ea1ebef9202527b04",
        "https://github.com/django-cms/django-cms/pull/8703"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639",
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61663.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-61663",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490034,
  "published_at": "2026-08-20T18:07:28.005+00:00"
}