CVE-2026-87963: Unknown Yo

High severity, CVSS 8.6. EPSS: 0.4% chance of exploitation in the next 30 days.

The Yo WordPress plugin from 1.1 through 1.3.1 does not sanitize or parameterize the username request parameter before using it in a SQL query, and reads it before WordPress applies its request escaping, allowing unauthenticated attackers to perform SQL injection and read arbitrary database contents including administrator password hashes.

Affected products

• Unknown Yo: from 1.1, up to and including 1.3.1

Published 2026-09-17. Last modified 2026-09-20.