CVE-2026-76547 User Profile Builder CVE debrief

Who should care

Administrators and users of the User Profile Builder WordPress plugin should verify their version and take defensive actions. This includes reviewing installed plugins for potential gadgets, restricting access to configuration file imports, and monitoring for suspicious activity. Security teams should also review the vulnerability and provide guidance on compensating controls and exposure review.

Technical summary

The User Profile Builder WordPress plugin before 4.0.1 does not validate the type of data being deserialized when importing a configuration file, allowing high privilege users such as administrators to conduct PHP Object Injection attacks. The affected feature is a free add-on which is disabled by default, and no POP chain is present in the plugin itself, so further impact requires a suitable gadget from another installed plugin or extension.

Defensive priority

Administrators should verify the User Profile Builder plugin version and restrict access to configuration file imports.

Recommended defensive actions

• Verify User Profile Builder plugin version is 4.0.1 or later
• Restrict access to configuration file imports for high-privilege users
• Monitor for suspicious configuration file imports
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The evidence provided is limited, indicating a PHP Object Injection vulnerability in the User Profile Builder plugin before version 4.0.1. The affected feature is a free add-on which is disabled by default. Further impact requires a suitable gadget from another installed plugin. Defenders should verify their plugin version, review installed plugins for potential gadgets, and monitor for suspicious configuration file imports.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.