org.xwiki.platform:xwiki-platform-skin-skinx vulnerable to basic Cross-site Scripting by exploiting JSX or SSX plugins

Vulnerability 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.

References

• https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-cmvg-w72j-7phx
• https://github.com/xwiki/xwiki-platform/commit/fe65bc35d5672dd2505b7ac4ec42aec57d500fbb
• https://jira.xwiki.org/browse/XWIKI-19514
• https://jira.xwiki.org/browse/XWIKI-19583
• https://jira.xwiki.org/browse/XWIKI-9119