GHSA-4wc6-hqv9-qc97

### Impact
A stored XSS can be exploited by users with edit rights by adding a `AppWithinMinutes.FormFieldCategoryClass` class on a page and setting the payload on the page title.
Then, any user visiting `/xwiki/bin/view/AppWithinMinutes/ClassEditSheet` executes the payload.

See https://jira.xwiki.org/browse/XWIKI-20365 for me details.

### Patches
The issue has been patched on XWiki 14.4.8, 14.10.4, and 15.0 ?

### Workarounds
The issue can be fixed by updating `AppWithinMinutes.ClassEditSheet` with this [patch](https://github.com/xwiki/xwiki-platform/commit/1b87fec1e5b5ec00b7a8c3c3f94f6c5e22547392#diff-79e725ec7125cced7d302e1a1f955a76745af26ef28a148981b810e85335d302).

### References
- https://github.com/xwiki/xwiki-platform/commit/1b87fec1e5b5ec00b7a8c3c3f94f6c5e22547392#diff-79e725ec7125cced7d302e1a1f955a76745af26ef28a148981b810e85335d302
- https://jira.xwiki.org/browse/XWIKI-20365

### For more information

If you have any questions or comments about this advisory:

* Open an issue in [Jira XWiki.org](https://jira.xwiki.org/)
* Email us at [Security Mailing List](mailto:[email protected])

### Attribution

This vulnerability has been reported on Intigriti by René de Sain @renniepak.