Description
Wordpress is an open source CMS. One of the blocks in the WordPress editor can be exploited in a way that exposes password-protected posts and pages. This requires at least contributor privileges. This has been patched in WordPress 5.7.1, along with the older affected versions via minor releases. It's strongly recommended that you keep auto-updates enabled to receive the fix.
Remediation
References
Related Vulnerabilities
WordPress Plugin IzeeChat-Live Chat Cross-Site Scripting (1.0)
Jenkins Improper Input Validation Vulnerability (CVE-2012-6073)
WordPress Plugin Cool Timeline (Horizontal & Vertical Timeline) Cross-Site Request Forgery (2.0.2)
PHP Resource Management Errors Vulnerability (CVE-2010-1917)
Roundcube Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2015-5383)