Concrete CMS 9.5.0 and below is vulnerable to IDOR in the Express Entry Detail block

{
  "id": "4761652a9e2240d04b047450cd8c7cfa734ce673fc7348fe4e2081ca9778e648",
  "url": "https://osv.dev/vulnerability/CVE-2026-7881",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Concrete CMS 9.5.0 and below is vulnerable to IDOR in the Express Entry Detail block",
    "summary": "Concrete CMS 9.5.0 and below is subject to Insecure Direct Object Reference (IDOR) in the Express Entry Detail block via the exEntryID parameter. This IDOR leads to unauthorized access to all Express form submissions. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Tristan Madani for reporting.",
    "evidence": "osv:CVE-2026-7881",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-7881",
      "aliases": [
        "CVE-2026-7881",
        "GHSA-chfm-cm6h-q5x7"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/concretecms/concretecms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c747e425266ac50c12b5f2f74fa895ecec5cd777"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.0"
                      },
                      {
                        "fixed": "9.5.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "9.5.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "9.5.0RC2",
            "9.5.0RC1",
            "9.4.4",
            "9.4.3",
            "9.4.2",
            "9.4.1",
            "9.4.0",
            "9.4.0RC2",
            "9.4.0RC1",
            "9.3.7",
            "9.3.6",
            "9.3.5",
            "9.3.0",
            "9.3.4",
            "9.3.3",
            "9.3.2",
            "9.3.1",
            "8.4.1",
            "8.3.1",
            "8.2.1",
            "8.2.0",
            "8.2.0RC2",
            "8.1.0",
            "5.7.5.7",
            "5.7.5.6",
            "5.7.5.5",
            "5.7.5.2",
            "5.7.4.1",
            "5.7.3.1",
            "5.7.3",
            "5.7.2.1",
            "5.7.2",
            "5.7.0.4",
            "5.7.1",
            "5.7.0.3",
            "5.7.0.1",
            "5.7.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-7881.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.514811195Z",
      "provider": "osv",
      "references": [
        "https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7881.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-7881",
        "https://github.com/concretecms/concretecms"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "ConcreteCMS",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7881.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-7881",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504930,
  "published_at": "2026-05-21T21:09:18.551+00:00"
}