Security Alert Summary
The Defender Security WordPress plugin prior to version 6.2.0 does not restrict a network-wide setting to network administrators on multisite installations. This weakness allows an administrator of any single site in a multisite network to execute arbitrary code across the entire network.
CVE Details
- CVE ID:
CVE-2026-19225 - Affected component: Defender Security WordPress plugin
- Affected versions: Versions before 6.2.0 (example affected version reported: 5.0.0)
- Published: August 27, 2026 at 06:16:57 AM UTC
- Last modified: August 27, 2026 at 06:16:57 AM UTC
- CVSS v3.1 base score / severity / vector: Not provided in the CVE data
- Authentication / privileges / user interaction: Authentication required. An authenticated administrator of any single site on a multisite network can exploit the issue. No additional user interaction is required beyond having those privileges.
- Primary impact: Integrity and availability (arbitrary code execution across the network). Confidentiality impact is not specified in the provided data but could be possible depending on executed actions.
- CWE / weakness ID: Not provided in the CVE data
Technical Details
The plugin fails to restrict a network-wide configuration setting to network administrators on WordPress multisite installations. Because this restriction is missing, an administrator who has control of a single site within a multisite network can change the network-wide setting in a way that leads to arbitrary code execution across all sites in the network.
The description identifies the core issue as a missing restriction on a network-wide setting. No specific functions, REST API endpoints, or code paths are named in the provided data. The impact described in the CVE is the ability for a site-scoped administrator to execute arbitrary code at the network level, which can modify site behavior, install or alter code, or affect other sites in the multisite deployment.
How This Could Impact Your Website
Consider a multisite setup with a site owner, internal staff editors, and an external contractor who manages one subsite. If the contractor has administrator privileges for their subsite, the weakness could allow them to change the network-wide setting and execute actions that affect all subsites. Practical consequences include unauthorized changes to site code or configuration, potential disruption of services across multiple subsites, and increased risk of data access depending on the executed code.
Even if the immediate effect is not data theft, actions enabled by arbitrary code execution can expose internal user email addresses or create conditions that enable targeted phishing or social engineering campaigns against staff and contributors. professional review can help determine whether your multisite setup and user privileges are appropriately configured.
Recommended Actions
- Update the affected plugin as soon as a patched version is available.
- Review and reduce unnecessary user roles, especially site administrators and contributors on multisite installs.
- Enforce strong passwords and enable two-factor authentication for editors and administrators.
- Remove unused or unmaintained plugins from your installation.
- Monitor site activity and logs for unusual behavior that could indicate exploitation.
If you
like help reviewing your plugins, user roles, or overall WordPress security posture, our team is happy to help.
