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
Photoracer 'id' Parameter SQL Injection (1.0)
Product Catalog Privilege Escalation (3.8.1)
FrontAccounting Multiple SQL Injection Vulnerabilities (CVE-2014-3973)
WordPress Improper Input Validation Vulnerability (CVE-2018-20152)
e107 Improper Control of Generation of Code ('Code Injection') Vulnerability (CVE-2008-1989)