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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.

References

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