Security advisory

{
  "id": "27c1e32a0a9734224197f6796108c40ce9c6692981938ff0d1c0a54e416e64f4",
  "url": "https://osv.dev/vulnerability/CVE-2026-48958",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-48958",
    "summary": "An improper access check allows unauthorized users to create custom fields via webservices endpoints.",
    "evidence": "osv:CVE-2026-48958",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-48958",
      "aliases": [
        "BIT-joomla-2026-48958",
        "CVE-2026-48958"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/joomla/joomla-cms",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5f20de27b9640124ba185670a36ec40ebc9ec3f9"
                },
                {
                  "fixed": "09525fc6f24b0a461633f97b367aabae793a40ba"
                },
                {
                  "introduced": "0db7d502466ae41242ad761424f76378458fb819"
                },
                {
                  "fixed": "c623e73b17c749f4644cb5634f59ca683b69d17b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "5.4.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.0.0"
                      },
                      {
                        "fixed": "6.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48958.json"
          }
        }
      ],
      "modified": "2026-10-27T02:30:38.179486917Z",
      "provider": "osv",
      "references": [
        "https://developer.joomla.org/security-centre/1066-20260712-core-incorrect-access-control-in-com-fields-webservice-endpoints.html"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2026-48958",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 460033,
  "published_at": "2026-07-07T19:16:54.567+00:00"
}