GHSA-xwph-x6xj-wggv

### Impact

It is possible to bypass the existing security measures put in place to avoid open redirect by using a redirect such as `//mydomain.com` (i.e. omitting the `http:`). It was also possible to bypass it when using URL such as `http:/mydomain.com`.

### Patches
The problem has been patched on XWiki 13.10.10, 14.4.4 and 14.8RC1.

### Workarounds
The only way to workaround the bug is by providing a patched jar of xwiki-platform-oldcore containing the following changes: https://github.com/xwiki/xwiki-platform/commit/e4f7f68e93cb08c25632c126356d218abf192d1e#diff-c445f288d5d63424f56ef13f65514ab4e174a72e979b53b88197c2b7def267cf.

### References

* Jira ticket of the reported vulnerability: https://jira.xwiki.org/browse/XWIKI-19994
* Jira ticket of the original mechanism put in place to prevent open redirect: https://jira.xwiki.org/browse/XWIKI-10309
* Original advisory about open redirect: https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-jp55-vvmf-63mv

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