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CVE-2026-15038 – Authentication Bypass / Remote Code Execution – InfiniteWP Client WordPress Plugin

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Summary

CVE-2026-15038 is a critical authentication bypass (CWE-287, Improper Authentication) in the InfiniteWP Client WordPress plugin before version 1.13.6. On WordPress Multisite installations, the plugin fails to properly verify the site-connection state and the authenticity of requests to its remote-management endpoint, allowing unauthenticated attackers to hijack an administrator session and take over the entire network, leading to remote code execution. It carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The plugin does not properly verify the site-connection state and the authenticity of requests to its remote-management endpoint on WordPress Multisite installations.
  • Trigger conditions: Affects Multisite installations of the InfiniteWP Client plugin prior to 1.13.6; no authentication is required to reach the vulnerable remote-management endpoint.
  • Attack vector: Network. An unauthenticated attacker sends a crafted request to the plugin’s remote-management endpoint, binds their own key to the installation, and hijacks an administrator session.
  • Impact: Administrator session takeover and network-wide compromise on Multisite, leading to remote code execution with high impact to confidentiality, integrity, and availability.

Affected software

  • InfiniteWP Client WordPress plugin — all versions before 1.13.6.

Severity

  • CVSS v3.1 base score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the InfiniteWP Client plugin to version 1.13.6 or later.
  • If no patch can be applied: Restrict or block network access to the plugin’s remote-management endpoint, and consider deactivating the InfiniteWP Client plugin on WordPress Multisite installations until it can be updated.

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/iwp-client/

References

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Map your entire attack surface (continously)

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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

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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.

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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

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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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