Package Instance

XWiki Platform allows remote code execution from user account
### Impact
When an admin disables a user account, the user's profile is executed with the admin's rights. This allows a user to place malicious code in the user profile before getting an admin to disable the user account.

To reproduce, as a user without script nor programming rights, edit the about section of your user profile and add `{{groovy}}services.logging.getLogger("attacker").error("Hello from Groovy!"){{/groovy}}`.
As an admin, go to the user profile and click the "Disable this account" button.
Then, reload the page. If the logs show `attacker - Hello from Groovy!` then the instance is vulnerable.

### Patches
This has been patched in XWiki 14.10.21, 15.5.5, 15.10.6 and 16.0.0.

### Workarounds
We're not aware of any workaround except upgrading.

### References
* https://jira.xwiki.org/browse/XWIKI-21611
* https://github.com/xwiki/xwiki-platform/commit/f89c8f47fad6e5cc7e68c69a7e0acde07f5eed5a

Path Traversal in XWiki Platform
### Impact

One can ask for any file located in the classloader using the template API and a path with ".." in it. For example 

```
{{template name="../xwiki.hbm.xml"/}}
```

To our knownledge none of the available files of the classloader in XWiki Standard contain any strong confidential data, hence the low confidentiality value of this advisory.

### Patches

The issue is patched in versions 14.0 and 13.10.3.

### Workarounds

There's no easy workaround for this issue, administrators should upgrade their wiki.

### References

 * https://jira.xwiki.org/browse/XWIKI-19349
 * https://github.com/xwiki/xwiki-platform/commit/4917c8f355717bb636d763844528b1fe0f95e8e2

### 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:security@xwiki.org)