CVE-2022-31175: @ckeditor/ckeditor5 markdown gfm Cross-Site Scripting Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-42wq-rch8-6f6j",
  "modified" : "2022-08-11T18:08:35Z",
  "published" : "2022-08-06T09:40:43Z",
  "aliases" : [ "CVE-2022-31175" ],
  "summary" : "CKEditor5 cross-site scripting vulnerability caused by the editor instance destroying process",
  "details" : "### Affected packages\n@ckeditor/ckeditor5-markdown-gfm\n@ckeditor/ckeditor5-html-support\n@ckeditor/ckeditor5-html-embed\n\n### Impact\nA cross-site scripting vulnerability has been discovered affecting three optional CKEditor 5's packages. The vulnerability allowed to trigger a JavaScript code after fulfilling special conditions:\n\na) Using one of the affected packages. In case of `ckeditor5-html-support` and `ckeditor5-html-embed`, additionally, it was required to use a configuration that allows unsafe markup inside the editor,\nb) Initializing the editor on an element and using an element other than `<textarea>` as a base,\nc) Destroying the editor instance.\n\nThe root cause of the issue was a mechanism responsible for updating the source element with the markup coming from the CKEditor 5 data pipeline after destroying the editor. \n\nThis vulnerability might affect a small percent of integrators that depend on dynamic editor initialization/destroy and use [Markdown](https://ckeditor.com/docs/ckeditor5/latest/features/markdown.html), [General HTML Support](https://ckeditor.com/docs/ckeditor5/latest/features/general-html-support.html) or [HTML embed](https://ckeditor.com/docs/ckeditor5/latest/features/html-embed.html) features.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 35.0.1.\n\n### For more information\nEmail us at [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@ckeditor/ckeditor5-markdown-gfm"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "35.0.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@ckeditor/ckeditor5-html-support"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "35.0.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@ckeditor/ckeditor5-html-embed"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "35.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-42wq-rch8-6f6j"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-31175"
  }, {
    "type" : "WEB",
    "url" : "https://ckeditor.com/docs/ckeditor5/latest/features/general-html-support.html"
  }, {
    "type" : "WEB",
    "url" : "https://ckeditor.com/docs/ckeditor5/latest/features/html-embed.html"
  }, {
    "type" : "WEB",
    "url" : "https://ckeditor.com/docs/ckeditor5/latest/features/markdown.html"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ckeditor/ckeditor5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-08-06T09:40:43Z",
    "nvd_published_at" : "2022-08-03T19:15:00Z"
  }
}