Is CVE-2026-19225 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-19225 being exploited in the wild.

How severe is CVE-2026-19225?

Medium severity, with a CVSS score of 6.6, published 27 August 2026.

Which products and versions are affected?

WPMUDEV Defender Security before 6.2.0.

Is there a fix for CVE-2026-19225?

A patch was published on 2026-08-27. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-19225 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-19225?

Check whether you run WPMUDEV Defender Security at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-19225: WPMUDEV Defender Security privilege escalation to RCE on WordPress multisite

CVE-2026-19225 · Severity: medium · CVSS 6.6 · Published 2026-08-27

Defender Security is a WordPress security plugin used to protect WordPress sites. In multisite deployments, a site administrator (a less-privileged role) could exploit an improperly restricted network-wide setting to install malicious code that runs with the privileges of the entire WordPress network, affecting all sites simultaneously and potentially leading to data theft, defacement, or ransomware deployment.

Vendors: WPMUDEV.

Quick answers

Is CVE-2026-19225 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-19225 being exploited in the wild.
How severe is CVE-2026-19225?: Medium severity, with a CVSS score of 6.6, published 27 August 2026.
Which products and versions are affected?: WPMUDEV Defender Security before 6.2.0.
Is there a fix for CVE-2026-19225?: A patch was published on 2026-08-27. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-19225 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-19225?: Check whether you run WPMUDEV Defender Security at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a privilege escalation and arbitrary code execution flaw in the Hub Connector functionality. A site administrator on a WordPress multisite network can mint a network-wide authentication credential through a subsite connection screen belonging to a sibling WPMUDEV plugin, then use that credential to invoke a remote command channel (keyed via HMAC-SHA256 authentication) that accepts plugin installation requests. The attack requires the multisite to not yet be connected to WPMUDEV's hub service (the default state for the free plugin) and the presence of a sibling WPMUDEV plugin on the attacker's subsite to generate the necessary callback nonce. Once the credential is set network-wide, an attacker can install and activate arbitrary plugins across the entire network without further authentication. The vulnerability is fixed in version 6.2.0.

Affected products

WPMUDEV Defender Security before 6.2.0

Timeline

2026-08-25: disclosed
2026-08-27: patched

References

https://wpscan.com/vulnerability/5adace73-b1e5-4f1b-9676-6e9619dc54c4/

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