| Package | Affected versions | Patched versions |
|---|---|---|
| TinyMCE | ≥ 6.0.0, < 6.3.1< 5.10.7 | 6.3.15.10.7 |
| tinymce/tinymce | ≥ 6.0.0, < 6.3.1< 5.10.7 | 6.3.15.10.7 |
| tinymce | ≥ 6.0.0, < 6.3.1< 5.10.7 | 6.3.15.10.7 |
| tinymce | ≥ 6.0.0, < 6.3.1< 5.10.7 | 6.3.15.10.7 |
A cross-site scripting (XSS) vulnerability was discovered in the alert and confirm dialogs when these dialogs were provided with malicious HTML content. This can occur in plugins that use the alert or confirm dialogs, such as in the image plugin, which presents these dialogs when certain errors occur. The vulnerability allowed arbitrary JavaScript execution when an alert presented in the TinyMCE UI for the current user.
This vulnerability has been patched in TinyMCE 5.10.7 and TinyMCE 6.3.1 by ensuring HTML sanitization was still performed after unwrapping invalid elements.
To avoid this vulnerability:
To reduce the impact of this vulnerability:
images_upload_handler returns a valid value as per the images_upload_handler documentation.If you have any questions or comments about this advisory:
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