Description
XWiki Platform is a generic wiki platform. Starting in 2.3 and prior to versions 14.10.15, 15.5.2, and 15.7-rc-1, anyone who can edit an arbitrary wiki page in an XWiki installation can gain programming right through several cases of missing escaping in the code for displaying sections in the administration interface. This impacts the confidentiality, integrity and availability of the whole XWiki installation. Normally, all users are allowed to edit their own user profile so this should be exploitable by all users of the XWiki instance. This has been fixed in XWiki 14.10.15, 15.5.2 and 15.7RC1. The patches can be manually applied to the `XWiki.ConfigurableClassMacros` and `XWiki.ConfigurableClass` pages.
Remediation
References
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qj86-p74r-7wp5
https://github.com/xwiki/xwiki-platform/commit/0f367aaae4e0696f61cf5a67a75edd27d1d16db6
https://github.com/xwiki/xwiki-platform/commit/1157c1ecea395aac7f64cd8a6f484b1225416dc7
https://github.com/xwiki/xwiki-platform/commit/749f6aee1bfbcf191c3734ea0aa9eba3aa63240e
https://github.com/xwiki/xwiki-platform/commit/bd82be936c21b65dee367d558e3050b9b6995713
https://jira.xwiki.org/browse/XWIKI-21121
https://jira.xwiki.org/browse/XWIKI-21122
https://jira.xwiki.org/browse/XWIKI-21194
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