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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWM3OHctMmd3Ny1nanYz

XSS in TinyMCE

Impact

A cross-site scripting (XSS) vulnerability was discovered in: the core parser and media plugin. 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 4.9.9 or lower and TinyMCE 5.2.1 or lower.

Patches

This vulnerability has been patched in TinyMCE 4.9.10 and 5.2.2 by improved HTML parsing and sanitization logic.

Workarounds

The workarounds available are:

Example: Manually strip CDATA elements

setup: function(editor) {
  editor.on('PreInit', function() {
    editor.parser.addNodeFilter('#cdata', function(nodes) {
      for (var i = 0; i < nodes.length; i++) {
        nodes[i].remove();
      }
    });
  });
}

Acknowledgements

Tiny Technologies would like to thank Michał Bentkowski and intivesec for discovering these vulnerabilities.

References

https://www.tiny.cloud/docs/release-notes/release-notes522/#securityfixes

For more information

If you have any questions or comments about this advisory:

Permalink: https://github.com/advisories/GHSA-c78w-2gw7-gjv3
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWM3OHctMmd3Ny1nanYz
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: almost 4 years ago
Updated: over 1 year ago


Identifiers: GHSA-c78w-2gw7-gjv3, CVE-2019-1010091
References: Repository: https://github.com/tinymce/tinymce
Blast Radius: 0.0

Affected Packages

npm:tinymce
Dependent packages: 1,197
Dependent repositories: 12,552
Downloads: 2,425,732 last month
Affected Version Ranges: >= 5.0.0, < 5.2.2, < 4.9.10
Fixed in: 5.2.2, 4.9.10
All affected versions: 4.0.25, 4.0.26, 4.0.27, 4.0.28, 4.1.0, 4.1.2, 4.1.3, 4.1.4, 4.1.5, 4.1.6, 4.1.7, 4.1.8, 4.1.9, 4.1.10, 4.2.0, 4.2.1, 4.2.2, 4.2.3, 4.2.4, 4.2.5, 4.2.6, 4.2.7, 4.2.8, 4.3.0, 4.3.1, 4.3.2, 4.3.3, 4.3.5, 4.3.6, 4.3.7, 4.3.8, 4.3.9, 4.3.10, 4.3.11, 4.3.12, 4.3.13, 4.4.0, 4.4.1, 4.4.2, 4.4.3, 4.5.0, 4.5.1, 4.5.2, 4.5.3, 4.5.4, 4.5.5, 4.5.6, 4.5.7, 4.5.8, 4.5.9, 4.5.10, 4.5.12, 4.6.0, 4.6.1, 4.6.2, 4.6.3, 4.6.4, 4.6.5, 4.6.6, 4.6.7, 4.7.0, 4.7.1, 4.7.2, 4.7.3, 4.7.4, 4.7.5, 4.7.6, 4.7.7, 4.7.8, 4.7.9, 4.7.10, 4.7.11, 4.7.12, 4.7.13, 4.8.0, 4.8.1, 4.8.2, 4.8.3, 4.8.4, 4.8.5, 4.9.0, 4.9.1, 4.9.2, 4.9.3, 4.9.4, 4.9.5, 4.9.6, 4.9.7, 4.9.8, 4.9.9, 5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.8, 5.0.9, 5.0.10, 5.0.11, 5.0.12, 5.0.13, 5.0.14, 5.0.15, 5.0.16, 5.1.0, 5.1.1, 5.1.2, 5.1.3, 5.1.4, 5.1.5, 5.1.6, 5.2.0, 5.2.1
All unaffected versions: 4.9.10, 4.9.11, 5.2.2, 5.3.0, 5.3.1, 5.3.2, 5.4.0, 5.4.1, 5.4.2, 5.5.0, 5.5.1, 5.6.0, 5.6.1, 5.6.2, 5.7.0, 5.7.1, 5.8.0, 5.8.1, 5.8.2, 5.9.0, 5.9.1, 5.9.2, 5.10.0, 5.10.1, 5.10.2, 5.10.3, 5.10.4, 5.10.5, 5.10.6, 5.10.7, 5.10.8, 5.10.9, 6.0.0, 6.0.1, 6.0.2, 6.0.3, 6.1.0, 6.1.1, 6.1.2, 6.2.0, 6.3.0, 6.3.1, 6.3.2, 6.4.0, 6.4.1, 6.4.2, 6.5.0, 6.5.1, 6.6.0, 6.6.1, 6.6.2, 6.7.0, 6.7.1, 6.7.2, 6.7.3, 6.8.0, 6.8.1, 6.8.2, 6.8.3, 7.0.0, 7.0.1