Anchor CMS through 0.12.7 Privilege Escalation via Missing Authorization on Admin User-Management Endpoints

{
  "id": "c6155deda55d930e529f4a89f91696a02972dbadbbbecb51affba3687d555cd3",
  "url": "https://osv.dev/vulnerability/CVE-2026-88959",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Anchor CMS through 0.12.7 Privilege Escalation via Missing Authorization on Admin User-Management Endpoints",
    "summary": "Anchor CMS through 0.12.7 fails to enforce role-based access control in admin user-management endpoints, allowing any authenticated low-privilege user to create administrator accounts or modify existing ones. Attackers with editor or user roles can POST directly to admin/users/add or admin/users/edit endpoints to create new administrator accounts or change the existing administrator's password, gaining full administrative access.",
    "evidence": "osv:CVE-2026-88959",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-88959",
      "aliases": [
        "CVE-2026-88959"
      ],
      "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/anchorcms/anchor-cms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "08e8e507909ee55b588674563b8ea21646ed9425"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.12.7"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.12.7"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.12.7",
            "0.12.6",
            "0.12.3a",
            "0.12.3",
            "0.12.1",
            "0.12",
            "0.9.3.1-a",
            "0.9.1",
            "0.9",
            "0.8.2",
            "0.8.1",
            "0.8",
            "0.7.2",
            "0.7",
            "0.6",
            "0.5",
            "0.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88959.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.246619532Z",
      "provider": "osv",
      "references": [
        "https://packagist.org",
        "https://gist.github.com/bozorovab2009-spec/57931237f774b78333f8fe47e84ec4aa",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88959.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-88959",
        "https://www.vulncheck.com/advisories/anchor-cms-through-0.12.7-privilege-escalation-via-missing-authorization-on-admin-user-management-endpoints",
        "https://github.com/anchorcms/anchor-cms",
        "https://github.com/anchorcms/anchor-cms/blob/0.12.7/anchor/routes/users.php"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88959.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-88959",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517519,
  "published_at": "2026-09-10T15:44:12.945+00:00"
}