Description
An issue was discovered in includes/page/Article.php in MediaWiki 1.36.x through 1.39.x before 1.39.5 and 1.40.x before 1.40.1. Deleted revision existence is leaked due to incorrect permissions being checked. This reveals that a given revision ID belonged to the given page title, and its timestamp, both of which are not supposed to be public information.
Remediation
References
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phpMyAdmin Other Vulnerability (CVE-2007-1325)
Ruby on Rails Cross-Site Request Forgery (CSRF) Vulnerability (CVE-2020-8167)