GHSA-5vm8-hhgr-jcjp

Описание

Impact

A cross-site scripting (XSS) vulnerability was discovered in the URL sanitization logic of the core parser for form elements. The vulnerability allowed arbitrary JavaScript execution when inserting a specially crafted piece of content into the editor using the clipboard or APIs, and then submitting the form. However, as TinyMCE does not allow forms to be submitted while editing, the vulnerability could only be triggered when the content was previewed or rendered outside of the editor. This impacts all users who are using TinyMCE 5.7.0 or lower.

Patches

This vulnerability has been patched in TinyMCE 5.7.1 by improved URL sanitization logic.

Workarounds

To work around this vulnerability, either:

• Upgrade to TinyMCE 5.7.1 or higher
• Manually sanitize form URL attributes using a TinyMCE node filter.
• Disable form elements in your content using the invalid_elements setting.

Example: Sanitizing using a node filter

Example: Using invalid_elements

Acknowledgements

Tiny Technologies would like to thank Mikhail Khramenkov at Solar Security Research Team for discovering this vulnerability.

References

https://www.tiny.cloud/docs/release-notes/release-notes571/#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