GHSA-vmhh-xh3g-j992

### Impact
We found a possible XSS vector in the `FlamingoThemesCode.WebHomeSheet` wiki page related to the "newThemeName" form field.

### Patches

The issue is patched in versions 12.10.11, 14.0-rc-1, 13.4.7, 13.10.3.

### Workarounds
The easiest workaround is to edit the wiki page `FlamingoThemesCode.WebHomeSheet` (with wiki editor) and change the line

```
<input type="hidden" name="newThemeName" id="newThemeName" value="$request.newThemeName" />
```

into

```
<input type="hidden" name="newThemeName" id="newThemeName" value="$escapetool.xml($request.newThemeName)" />
```

### References
* https://jira.xwiki.org/browse/XWIKI-19294
* https://github.com/xwiki/xwiki-platform/commit/bd935320bee3c27cf7548351b1d0f935f116d437

### For more information
If you have any questions or comments about this advisory:
* Open an issue in [Jira XWiki](https://jira.xwiki.org)
* Email us at [security mailing list](mailto:[email protected])