Vulnerability-Lookup

GHSA-VRV8-V4W8-F95H

Vulnerability from github – Published: 2020-08-11 14:55 – Updated: 2023-05-22 14:51

Summary

Cross-site scripting vulnerability in TinyMCE

Details

Impact

A cross-site scripting (XSS) vulnerability was discovered in the core parser. 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 4.9.10 or lower and TinyMCE 5.4.0 or lower.

Patches

This vulnerability has been patched in TinyMCE 4.9.11 and 5.4.1 by improved HTML parsing and sanitization logic.

Workarounds

The workarounds available are: - upgrade to either TinyMCE 4.9.11 or TinyMCE 5.4.1 or - enable the media plugin, which overrides the default parsing behaviour for iframes or - add the following workaround to update the parsing schema rules for iframes:

Example: Change the default schema for iframes

setup: function(editor) {
  editor.on('PreInit', function() {
    editor.schema.getSpecialElements()['iframe'] = /</iframe[^>]*>/gi;
  });
}

Acknowledgements

Tiny Technologies would like to thank George Steketee and Chris Davis at Bishop Fox for discovering this vulnerability.

References

https://www.tiny.cloud/docs/release-notes/release-notes54/#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

Severity

6.1 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

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  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "tinymce"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.9.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "tinymce"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-12648"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-08-10T22:39:05Z",
    "nvd_published_at": "2020-08-14T14:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nA cross-site scripting (XSS) vulnerability was discovered in the core parser. 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 4.9.10 or lower and TinyMCE 5.4.0 or lower.\n\n### Patches\nThis vulnerability has been patched in TinyMCE 4.9.11 and 5.4.1 by improved HTML parsing and sanitization logic.\n\n### Workarounds\nThe workarounds available are:\n- upgrade to either TinyMCE 4.9.11 or TinyMCE 5.4.1\nor\n- enable the media plugin, which overrides the default parsing behaviour for iframes\nor\n- add the following workaround to update the parsing schema rules for iframes:\n\n#### Example: Change the default schema for iframes\n```js\nsetup: function(editor) {\n  editor.on(\u0027PreInit\u0027, function() {\n    editor.schema.getSpecialElements()[\u0027iframe\u0027] = /\u003c/iframe[^\u003e]*\u003e/gi;\n  });\n}\n```\n\n### Acknowledgements\nTiny Technologies would like to thank George Steketee and Chris Davis at [Bishop Fox](https://www.bishopfox.com/) for discovering this vulnerability.\n\n### References\nhttps://www.tiny.cloud/docs/release-notes/release-notes54/#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)",
  "id": "GHSA-vrv8-v4w8-f95h",
  "modified": "2023-05-22T14:51:38Z",
  "published": "2020-08-11T14:55:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tinymce/tinymce/security/advisories/GHSA-vrv8-v4w8-f95h"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tinymce/tinymce/pull/5843"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tinymce/tinymce/commit/2b71c922214d388838d930806207a66c14e80f63"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tinymce/tinymce/commit/696e43658dc9750ec24fdc4650bd2be9653daf5b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tinymce/tinymce"
    },
    {
      "type": "WEB",
      "url": "https://www.tiny.cloud/docs/release-notes/release-notes54/#securityfixes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Cross-site scripting vulnerability in TinyMCE"
}

CVE-2020-12648 (GCVE-0-2020-12648)

Vulnerability from cvelistv5 – Published: 2020-08-14 13:52 – Updated: 2024-08-04 12:04

Summary

A cross-site scripting (XSS) vulnerability in TinyMCE 5.2.1 and earlier allows remote attackers to inject arbitrary web script when configured in classic editing mode.

Severity

No CVSS data available.

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 28/100 over 2334 records in the last 180 days details

References

1 reference

URL	Tags
https://labs.bishopfox.com/advisories/tinymce-ver…	x_refsource_MISC

Date Public

2020-08-12 00:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

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.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

GHSA-VRV8-V4W8-F95H

Impact

Patches

Workarounds

Example: Change the default schema for iframes

Acknowledgements

References

For more information

CVE-2020-12648 (GCVE-0-2020-12648)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour