Creation of new database tables through login form on PostgreSQL
### Impact
It's possible to make XWiki create many new schemas and fill them with tables just by using a crafted user identifier in the login form.
### Patches
The problem has been patched in XWiki 13.10.8, 14.6RC1 and 14.4.2.
### Workarounds
The only workarounds for this are:
* use an authenticator which does interpret the login as a reference to a document
* using a different database than PostgreSQL
* upgrade XWiki
### References
https://jira.xwiki.org/browse/XWIKI-19886
### 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:security@xwiki.org)