What is CVE-2026-11366?

CVE-2026-11366 is a low-severity vulnerability in Monsterinsights, classified under Improper Authentication. CVSS score: 3.7/10. Published 2026-08-04.

How severe is CVE-2026-11366?

Low severity. CVSS v3 base score is 3.7 out of 10.

Auth bypass in Monsterinsights

CVE-2026-11366

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.

Vulnerability class: Broken Authentication

EPSS: 0.002 (9.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Unknown Monsterinsights — versions 0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-11366?: CVE-2026-11366 is a low-severity vulnerability in Monsterinsights, classified under Improper Authentication. CVSS score: 3.7/10. Published 2026-08-04.
How severe is CVE-2026-11366?: Low severity. CVSS v3 base score is 3.7 out of 10.