In MediaWiki through 1.33.0, Special:Redirect allows information disclosure of suppressed usernames via a User ID Lookup.
| Software | From | Fixed in |
|---|---|---|
| mediawiki / mediawiki | - | 1.33.0.x |
| fedoraproject / fedora | 30 | 30.x |
| fedoraproject / fedora | 31 | 31.x |
| debian / debian_linux | 9.0 | 9.0.x |
| debian / debian_linux | 10.0 | 10.0.x |