CVE-2026-15038

InfiniteWP Client <= 1.13.5 - Unauthenticated Administrator Account Takeover on Multi-Site

2026-08-04 00:00
Jakub Herman

Strategic Overview

Status
Patched in 1.13.6
Affected Plugin
InfiniteWP Client
Affected Version
<= 1.13.5
CVSS
8.1High
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2026-15038
View all InfiniteWP Client vulnerabilities

At a glance

CVE-2026-15038 is a high-severity Missing Authorization vulnerability in the InfiniteWP Client WordPress plugin, affecting versions <= 1.13.5. It carries a CVSS score of 8.1 (reachable over the network; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 1.13.6; sites on affected versions should update now. Disclosed August 2026, reported by Jakub Herman.

Vulnerability Overview

The InfiniteWP Client plugin for WordPress is vulnerable to Administrator Account Takeover on Multi-Site in all versions up to, and including, 1.13.5. This makes it possible for unauthenticated attackers to connect their own client on multi-site instances and takeover the entire site.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-862: Missing Authorization

Reaching this weakness in InfiniteWP Client <= 1.13.5 takes no account at all. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For InfiniteWP Client the fix is 1.13.6: builds <= 1.13.5 are affected, anything from 1.13.6 onward is not.

Remediation

Update to version 1.13.6, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: InfiniteWP Client 1.13.6 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-15038https://www.wordfence.com/threat-intel/vulnerabilities/id/64adf533-d83f-4d2d-8356-bdc438f21b13https://nvd.nist.gov/vuln/detail/CVE-2026-15038

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C