GHSA-XQ3R-2QV5-VQQM XWiki Platform has path traversal via resources parameter in ssx and jsx endpoints when using leading slash

Impact It's possible to get access and read configuration files by using URLs such as http://localhost:8080/bin/ssx/Main/WebHome?resource=/../../WEB-INF/xwiki.cfg&minify=false. This can apparently be reproduced on Tomcat instances. Patches This has been patched in 18.0.0-rc-1, 17.10.3, 17.4.9,...