CVE-2026-11366: Unknown Monsterinsights

Low severity, CVSS 3.7. EPSS: 0.2% chance of exploitation in the next 30 days.

The MonsterInsights WordPress plugin before 11.1.0 does not correctly validate the signature on one of its unauthenticated AJAX actions: when the MonsterInsights WordPress plugin before 11.1.0 is not connected to Google Analytics the HMAC signing key is empty, which lets unauthenticated attackers forge a valid signature and overwrite a MonsterInsights WordPress plugin before 11.1.0 configuration value, disrupting the MonsterInsights WordPress plugin before 11.1.0's server-side analytics in Manual GA4 mode.

Affected products

• Unknown Monsterinsights: before 11.1.0 (fixed in 11.1.0)

Published 2026-08-04. Last modified 2026-08-26.