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CVE-2026-66712 – Broken Access Control (Missing Authorization) – WordPress Simple Membership plugin

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Summary

CVE-2026-66712 is a broken access control (missing authorization, CWE-862) vulnerability in the WordPress Simple Membership plugin by wp.insider. It affects all versions through 4.7.8 and carries a CVSS v3.1 base score of 7.5 (High), allowing an unauthenticated, network-based attacker to modify data without authorization.

Technical details

  • Root cause: The plugin fails to enforce proper authorization checks on restricted functionality, permitting access without the required privileges (CWE-862, Missing Authorization).
  • Trigger conditions: No authentication, special privileges, or user interaction are required to exploit the flaw.
  • Attack vector: Network (remote). The issue is reachable over HTTP against an internet-facing WordPress site running the affected plugin.
  • Impact: Unauthorized modification of data / integrity. There is no confidentiality or availability impact per the published CVSS vector.

Affected software

  • WordPress Simple Membership plugin (by wp.insider) — all versions through and including 4.7.8.

Severity

  • CVSS v3.1 base score: 7.5 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Mitigation and recommended actions

  • Immediate: Update the Simple Membership plugin to version 4.7.9 or later, which resolves the vulnerability.
  • If no patch can be applied: Restrict access to the affected WordPress site at the network or WAF layer and monitor for unauthorized data modification until the plugin can be upgraded.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw HTTP response body: /wp-content/plugins/simple-membership/

References

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Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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