XWiki Platform vulnerable to reflected cross-site scripting via xredirect parameter in delete template
ImpactUsers are able to forge an URL with a payload allowing to inject Javascript in the page (XSS).
It's possible to exploit the delete template to perform a XSS, e.g. by using URL such as:xwiki/bin/get/FlamingoThemes/Cerulean?xpage=xpart&vm=delete.vm&xredirect=javascript:alert(document.domain)This vulnerability exists since XWiki 6.0-rc-1.PatchesThe vulnerability has been patched in XWiki 14.10.6 and 15.1. Note that a partial patch has been provided in 14.10.5 but wasn't enough to entirely fix the vulnerability.WorkaroundsIt's possible to workaround the vulnerability by editing the template delete.vm to perform checks on it, but note that the appropriate fix involves new APIs that have been recently introduced in XWiki. See the referenced jira tickets.ReferencesJira ticket about the original vulnerability: https://jira.xwiki.org/browse/XWIKI-20341Commit containing the first fix in the template: https://github.com/xwiki/xwiki-platform/commit/e80d22d193df364b07bab7925572720f91a8984aJira ticket about the second part of the vulnerability found after 14.10.5: https://jira.xwiki.org/browse/XWIKI-20672Commits containing the second fix in the template:https://github.com/xwiki/xwiki-platform/commit/13875a6437d4525ac4aeea25918f2d2dffac9ee1https://github.com/xwiki/xwiki-platform/commit/24ec12890ac7fa6daec8d0b3435cfcba11362fd5Introduction of the macro used for fixing all those vulnerabilities: https://jira.xwiki.org/browse/XWIKI-20583For more informationIf you have any questions or comments about this advisory:Open an issue in [Jira XWiki.org](https://jira.xwiki.org/)Email us at [Security Mailing List](mailto:security@xwiki.org)AttributionThis vulnerability has been reported by René de Sain @renniepak.