GHSA-27GM-GHR9-4V95

Vulnerability from github – Published: 2020-01-30 21:22 – Updated: 2023-06-27 16:50
VLAI?
Summary
Cross-site scripting vulnerability in TinyMCE
Details

Impact

A cross-site scripting (XSS) vulnerability was discovered in: the core parser, paste and visualchars plugins. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor via the clipboard or APIs. This impacts all users who are using TinyMCE 4.9.6 or lower and TinyMCE 5.1.3 or lower.

Patches

This vulnerability has been patched in TinyMCE 4.9.7 and 5.1.4 by improved parser logic and HTML sanitization.

Workarounds

The workarounds available are: - disable the impacted plugins - manually sanitize the content using the BeforeSetContent event (see below) - upgrade to either TinyMCE 4.9.7 or TinyMCE 5.1.4

Example: Manually sanitize content

editor.on('BeforeSetContent', function(e) {
  var sanitizedContent = ...; // Manually sanitize content here
  e.content = sanitizedContent;
});

Acknowledgements

Tiny Technologies would like to thank Michał Bentkowski for discovering this vulnerability.

References

https://www.tiny.cloud/docs/release-notes/release-notes514/#securityfixes

For more information

If you have any questions or comments about this advisory: * Open an issue in the TinyMCE repo * Email us at infosec@tiny.cloud

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "tinymce"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.9.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "tinymce"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-17480"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-01-30T19:38:09Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nA cross-site scripting (XSS) vulnerability was discovered in: the core parser, `paste` and `visualchars` plugins. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor via the clipboard or APIs. This impacts all users who are using TinyMCE 4.9.6 or lower and TinyMCE 5.1.3 or lower.\n\n### Patches\nThis vulnerability has been patched in TinyMCE 4.9.7 and 5.1.4 by improved parser logic and HTML sanitization.\n\n### Workarounds\nThe workarounds available are:\n- disable the impacted plugins\n- manually sanitize the content using the `BeforeSetContent` event (see below)\n- upgrade to either TinyMCE 4.9.7 or TinyMCE 5.1.4\n\n#### Example: Manually sanitize content\n```js\neditor.on(\u0027BeforeSetContent\u0027, function(e) {\n  var sanitizedContent = ...; // Manually sanitize content here\n  e.content = sanitizedContent;\n});\n```\n\n### Acknowledgements\nTiny Technologies would like to thank Micha\u0142 Bentkowski for discovering this vulnerability.\n\n### References\nhttps://www.tiny.cloud/docs/release-notes/release-notes514/#securityfixes\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in the [TinyMCE repo](https://github.com/tinymce/tinymce/issues)\n* Email us at [infosec@tiny.cloud](mailto:infosec@tiny.cloud)\n",
  "id": "GHSA-27gm-ghr9-4v95",
  "modified": "2023-06-27T16:50:58Z",
  "published": "2020-01-30T21:22:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tinymce/tinymce/security/advisories/GHSA-27gm-ghr9-4v95"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-17480"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tinymce/tinymce"
    },
    {
      "type": "WEB",
      "url": "https://portswigger.net/daily-swig/xss-vulnerability-patched-in-tinymce"
    },
    {
      "type": "WEB",
      "url": "https://www.tiny.cloud/docs/release-notes/release-notes514/#securityfixes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "Cross-site scripting vulnerability in TinyMCE"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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