CVE-2026-19224: Unknown Hummingbird Performance

High severity, CVSS 7.2. EPSS: 0.4% chance of exploitation in the next 30 days.

The Hummingbird Performance WordPress plugin before 3.21.2 does not restrict a network-wide setting to network administrators, allowing an administrator of any single site on a multisite network to execute arbitrary code across the entire network.

Affected products

• Unknown Hummingbird Performance: from 3.15.0, before 3.21.2 (fixed in 3.21.2)

Published 2026-09-04. Last modified 2026-09-08.