Cross-site scripting vulnerability in TinyMCE

Impact

A cross-site scripting (XSS) vulnerability was discovered in the URL sanitization logic of the core parser. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor using the clipboard or APIs. This impacts all users who are using TinyMCE 5.5.1 or lower.

Patches

This vulnerability has been patched in TinyMCE 5.6.0 by improved URL sanitization logic.

Workarounds

To work around this vulnerability, either:

• Upgrade to TinyMCE 5.6.0 or higher
• Manually sanitize iframe, object and embed URL attributes using a TinyMCE node filter.
• Disable iframe, object, and embed elements in your content using the invalid_elements setting.

Example: Sanitizing using a node filter

editor.parser.addNodeFilter('iframe,object,embed', function(nodes) {
  nodes.forEach(function(node) {
    if (node.attributes) {
      node.attributes.forEach(function(attr) {
        var name = attr.name;
        var value = attr.value;
        // Sanitize the attribute value here or remove it entirely
        var sanitizedValue = ...;
        node.attr(name, santizedValue);
      });
    }
  });
});

Example: Using invalid_elements

invalid_elements: 'iframe,object,embed'

Acknowledgements

Tiny Technologies would like to thank Aaron Bishop at SecurityMetrics for discovering this vulnerability.

References

https://www.tiny.cloud/docs/release-notes/release-notes56/#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