An issue was discovered in the CheckUser extension for MediaWiki through 1.42.1. The API can expose suppressed information for log events. (The log_deleted attribute is not applied to entries.)
{
    "cpes": [
        "cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*"
    ],
    "severity": "Medium"
}