Description
An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.
Remediation
References
Related Vulnerabilities
silverstripeCMS Unrestricted Upload of File with Dangerous Type Vulnerability (CVE-2020-9280)
PostgreSQL Integer Overflow or Wraparound Vulnerability (CVE-2026-14677)
MySQL CVE-2020-2779 Vulnerability (CVE-2020-2779)
WordPress Plugin Coming Soon & Maintenance Mode Page Unspecified Vulnerability (1.40)