Security advisory

{
  "id": "ccca6b8d39e7a31ee6b8bd6723413bf59aeea50da17a5696810cda1983a4acde",
  "url": "https://osv.dev/vulnerability/CVE-2020-9440",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-9440",
    "summary": "A cross-site scripting (XSS) vulnerability in the WSC plugin through 5.5.7.5 for CKEditor 4 allows remote attackers to run arbitrary web script inside an IFRAME element by injecting a crafted HTML element into the editor.",
    "evidence": "osv:CVE-2020-9440",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-9440",
      "aliases": [
        "CVE-2020-9440"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/ckeditor/ckeditor4",
              "type": "GIT",
              "events": [
                {
                  "introduced": "769d96134bcf29f5d3d870e25797ce9b9dc8289e"
                },
                {
                  "last_affected": "769d96134bcf29f5d3d870e25797ce9b9dc8289e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ckeditor:ckeditor:4.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0"
                      },
                      {
                        "last_affected": "4.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.0",
            "4.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-9440.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/ckeditor/ckeditor4-releases",
              "type": "GIT",
              "events": [
                {
                  "introduced": "870a561110a23435d78eda377400dca7f64d3bd3"
                },
                {
                  "last_affected": "870a561110a23435d78eda377400dca7f64d3bd3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:ckeditor:ckeditor:4.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.0"
                      },
                      {
                        "last_affected": "4.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.0",
            "4.0/standard"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-9440.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:31.939294552Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7OJ4BSS3VEAEXPNSOOUAXX6RDNECGZNO/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L322YA73LCV3TO7ORY45WQDAFJVNKXBE/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M4HHYQ6N452XTCIROFMJOTYEUWSB6FR4/",
        "https://ckeditor.com/blog/CKEditor-4.14-with-Paste-from-LibreOffice-released/#security-issues-fixed"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:webspellchecker:webspellchecker:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "webspellchecker:webspellchecker",
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "5.5.7.5"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "30"
                  },
                  {
                    "last_affected": "30"
                  },
                  {
                    "introduced": "31"
                  },
                  {
                    "last_affected": "31"
                  },
                  {
                    "introduced": "32"
                  },
                  {
                    "last_affected": "32"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-9440",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 432915,
  "published_at": "2020-03-10T17:15:13.207+00:00"
}