Description
XWiki Commons are technical libraries common to several other top level XWiki projects. There was no check in the author of a JavaScript xobject or StyleSheet xobject added in a XWiki document, so until now it was possible for a user having only Edit Right to create such object and to craft a script allowing to perform some operations when executing by a user with appropriate rights. This has been patched in XWiki 14.9-rc-1 by only executing the script if the author of it has Script rights.
Remediation
References
Related Vulnerabilities
WordPress Plugin Advanced Access Manager Cross-Site Scripting (6.7.9)
WordPress Plugin PushEngage Web Push Notifications Cross-Site Scripting (1.5.8)
Apache Tomcat Unrestricted Upload of File with Dangerous Type Vulnerability (CVE-2017-12617)
WordPress Plugin Juiz Social Post Sharer Multiple Cross-Site Scripting Vulnerabilities (1.3.3.7)