GHSA-j584-j2vj-3f93 XWiki Platform allows remote code execution from user account

• Maven org.xwiki.platform:xwiki-platform-oldcore: >= 13.4.7, < 14.10.21 → fixed in 14.10.21 • Maven org.xwiki.platform:xwiki-platform-oldcore: >= 13.10.3, < 14.10.21 → fixed in 14.10.21 • Maven org.xwiki.platform:xwiki-platform-oldcore: >= 15.0-rc-1, < 15.5.5 → fixed in 15.5.5 • Maven org.xwiki.platform:xwiki-platform-oldcore: >= 15.6-rc-1, < 15.10.6 → fixed in 15.10.6 • Maven org.xwiki.platform:xwiki-platform-oldcore: >= 16.0.0-rc-1, < 16.0.0 → fixed in 16.0.0

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