GHSA-27gm-ghr9-4v95 Cross-site scripting vulnerability in TinyMCE

• npm tinymce: < 4.9.7 → fixed in 4.9.7 • npm tinymce: >= 5.0.0, < 5.1.4 → fixed in 5.1.4

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 ```js 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 [email protected]