CVE-2021-36127
An issue was discovered in the CentralAuth extension in MediaWiki through 1.36. The Special:GlobalUserRights page provided search results which, for a suppressed MediaWiki user, were different than for any other user, thus easily disclosing suppressed accounts (which are supposed to be completely hidden).
Date published : 2021-07-02
https://gerrit.wikimedia.org/r/q/I4e4dbcad61e1d4f6fd8b038bf63d19c69081a8ec