Security advisory

{
  "id": "d3081058a27c3e7283f54f476c3d1a5a091023c1dd7086442714fd77653e15ef",
  "url": "https://osv.dev/vulnerability/CVE-2021-44223",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-44223",
    "summary": "WordPress before 5.8 lacks support for the Update URI plugin header. This makes it easier for remote attackers to execute arbitrary code via a supply-chain attack against WordPress installations that use any plugin for which the slug satisfies the naming constraints of the WordPress.org Plugin Directory but is not yet present in that directory.",
    "evidence": "osv:CVE-2021-44223",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-44223",
      "aliases": [
        "BIT-wordpress-2021-44223",
        "BIT-wordpress-multisite-2021-44223",
        "CVE-2021-44223"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wordpress/wordpress",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "50caeb6e61ad0c49d2c7e1d6d5115047a011f590"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44223.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/wordpress/wordpress-develop",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4b54a6c2c9a3be775cc6dda66ed207998b068c8f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44223.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:27.936652262Z",
      "provider": "osv",
      "references": [
        "https://make.wordpress.org/core/2021/06/29/introducing-update-uri-plugin-header-in-wordpress-5-8/",
        "https://vavkamil.cz/2021/11/25/wordpress-plugin-confusion-update-can-get-you-pwned/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-44223",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 431941,
  "published_at": "2021-11-25T15:15:09.8+00:00"
}