GHSA-V6MG-96C6-GMPQ

Vulnerability from github – Published: 2026-10-27 21:05 – Updated: 2026-10-27 21:05
VLAI
Summary
CKEditor: Cross-site scripting (XSS) in the engine package
Details

Impact

A Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 engine. This vulnerability could be triggered by inserting specially crafted markup under a specific General HTML Support configuration that allows inserting objects, leading to unauthorized JavaScript code execution in a browser context isolated from the origin of the application embedding the editor.

This vulnerability affects only installations where General HTML Support is enabled and configured to allow the affected HTML content.

Patches

The problem has been recognized and patched. The fix will be available in version 48.5.1 (and above) and 47.7.4 (LTS).

For more information

Email us at security@cksource.com if you have any questions or comments about this advisory.

Severity
3.1 (Low)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "ckeditor5"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "29.0.0"
            },
            {
              "fixed": "47.7.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@ckeditor/ckeditor5-engine"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "29.0.0"
            },
            {
              "fixed": "47.7.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "ckeditor5"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "48.0.0"
            },
            {
              "fixed": "48.5.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@ckeditor/ckeditor5-engine"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "48.0.0"
            },
            {
              "fixed": "48.5.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-116687"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-27T21:05:13Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Impact\nA Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 engine. This vulnerability could be triggered by inserting specially crafted markup under a specific General HTML Support configuration that allows inserting objects, leading to unauthorized JavaScript code execution in a browser context isolated from the origin of the application embedding the editor.\n\nThis vulnerability affects only installations where General HTML Support is enabled and configured to allow the affected HTML content.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version `48.5.1` (and above) and `47.7.4` (LTS).\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.",
  "id": "GHSA-v6mg-96c6-gmpq",
  "modified": "2026-10-27T21:05:13Z",
  "published": "2026-10-27T21:05:13Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-v6mg-96c6-gmpq"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ckeditor/ckeditor5/commit/4d9c5bb34f63cd956d15ccafbe584e14280c86a0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ckeditor/ckeditor5/commit/a750e38635db6a18c5b11599c09f4fd702850423"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ckeditor/ckeditor5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ckeditor/ckeditor5/releases/tag/v47.7.4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ckeditor/ckeditor5/releases/tag/v48.5.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "CKEditor: Cross-site scripting (XSS) in the engine package"
}



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