CVE-2026-11366 - MonsterInsights < 11.1.0 - Unauthenticated Measurement Protocol Secret Update via Empty-Key HMAC Bypass · CoreCVE

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LOW

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

Published Aug 4, 2026

3.7

LOW

CVSS 3.1

EPSS 0.25%

Description

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

Vendor n/a Product MonsterInsights Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <11.1.0

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

n/a

MonsterInsights

unaffected

Version	Status	Constraints
0	affected	<11.1.0

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-287

Improper Authentication

References (1)

https://wpscan.com/vulnerability/283331ca-cc2e-4c2c-9e3b-2e8c6f0c84d2/
exploitvdb-entrytechnical-description

Link	Providers	Tags
https://wpscan.com/vulnerability/283331ca-cc2e-4c2c-9e3b-2e8c6f0c84d2/		exploitvdb-entrytechnical-description

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner WPScan

Published Aug 4, 2026

Updated Aug 4, 2026

Reserved Jun 5, 2026

Link CVE-2026-11366

CISA Vulnrichment

Updated Aug 4, 2026

Status Deferred

Modified Aug 26, 2026

Link CVE-2026-11366

Severity n/a

Public date n/a

Links CVE-2026-11366