CVE-2023-5561: WordPress

Medium severity, CVSS 5.3. EPSS: 3.9% chance of exploitation in the next 30 days.

WordPress does not properly restrict which user fields are searchable via the REST API, allowing unauthenticated attackers to discern the email addresses of users who have published public posts on an affected website via an Oracle style attack

Affected products

• WordPress WordPress: from 4.7, before 4.7.27 (fixed in 4.7.27); from 4.8, before 4.8.23 (fixed in 4.8.23); from 4.9, before 4.9.24 (fixed in 4.9.24); from 5.0, before 5.0.20 (fixed in 5.0.20); from 5.1, before 5.1.17 (fixed in 5.1.17); from 5.2, before 5.2.19 (fixed in 5.2.19); …

Published 2023-10-16. Last modified 2026-06-17.