CVE-2026-11366lowCWE-287

CVE-2026-11366: low-severity vulnerability in MonsterInsights

MonsterInsights < 11.1.0 - Unauthenticated Measurement Protocol Secret Update via Empty-Key HMAC Bypass

Published

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28Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 3.7epss 0.2%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products
Unknown · MonsterInsights
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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