GHSA-9j5w-2cqc-cwj9

From HackerOne report [#1948040](https://hackerone.com/reports/1948040) by Halit AKAYDIN (hltakydn)

### Impact _What kind of vulnerability is it? Who is impacted?_

The TinyMCE WYSIWYG editor fails to filter scripts when rendering the HTML in specially crafted HTML tags.

### Patches _Has the problem been patched? What versions should users upgrade to?_

This vulnerability was fixed in version 20.2.0 by upgrading TinyMCE to a recent version in https://github.com/OpenMage/magento-lts/pull/3220

### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_

The WYSIWYG editor features could be disabled in the configuration. Possibly some WAF appliances would filter this attack.

### References _Are there any links users can visit to find out more?_

The attack is simply an exploit of the "onmouseover" attribute of an `img` element as described on [OWASP XSS Filter Evasion](https://cheatsheetseries.owasp.org/cheatsheets/XSS_Filter_Evasion_Cheat_Sheet.html)