XWiki Commons are technical libraries common to several other top level XWiki projects. It's possible to list some users who are normally not viewable from subwiki by requesting users on a subwiki which allows only global users with uorgsuggest.vm. This issue only concerns hidden users from main wiki. Note that the disclosed information are the username and the first and last name of users, no other information is leaked. The problem has been patched on XWiki 13.10.8, 14.4.3 and 14.7RC1.
XWiki Commons are technical libraries common to several other top level XWiki projects. It was possible to inject some code using the URL of authenticated endpoints. This problem has been patched on XWiki 13.10.11, 14.4.7 and 14.10.
Impact The HTML sanitizer, introduced in version 14.6-rc-1, allowed the injection of arbitrary HTML code and thus cross-site scripting via invalid data attributes. This can be exploited, e.g., via the link syntax in any content that supports XWiki syntax like comments in XWiki:
[[Link1>>https://XWiki.example.com||data-x/onmouseover="alert('XSS1')"]].
When a user moves the mouse over this link, the malicious JavaScript code is executed in the context of the user session. When this user is a privileged user who has programming rights, this allows server-side code execution with programming rights, impacting the confidentiality, integrity and availability of the XWiki instance.
Note that this vulnerability does not affect restricted cleaning in HTMLCleaner as there attributes are cleaned and thus characters like / and > are removed in all attribute names.
Patches This problem has been patched in XWiki 14.10.4 and 15.0 RC1 by making sure that data attributes only contain allowed characters.
Workarounds There are no known workarounds apart from upgrading to a version including the fix.
References https://jira.xwiki.org/browse/XCOMMONS-2606 https://github.com/xwiki/xwiki-commons/commit/0b8e9c45b7e7457043938f35265b2aa5adc76a68
For more information If you have any questions or comments about this advisory: Open an issue in Jira XWiki Email us at XWiki Security mailing-list