CVE-2026-100186 cozmoslabs CVE debrief

Who should care

Defenders responsible for WordPress installations using the User Profile Builder plugin, especially those with the Email Confirmation feature enabled, should assess exposure and prioritize patching or updating the plugin.

Why it matters

CVE-2026-100186 is a Stored Cross-Site Scripting vulnerability in the User Profile Builder plugin for WordPress. Defenders should verify exposure, especially if the Email Confirmation feature is enabled, and update or patch the plugin. The vulnerability allows unauthenticated attackers to inject web scripts in specific pages. The impact requires verification from official sources, and evidence is limited to CVE and NVD records.

• Defenders need to verify if their WordPress installations are using a vulnerable version of the User Profile Builder plugin and the Email Confirmation feature is enabled.
• Successful exploitation could allow attackers to inject malicious scripts, potentially leading to unauthorized actions or data exposure.
• Defenders should prioritize patching or updating the plugin to prevent potential cross-site scripting attacks.
• Further analysis is required to determine the full scope of affected systems and potential business impact.

Technical summary

The User Profile Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the First Name field in versions up to, and including, 4.0.3. This vulnerability is due to insufficient input sanitization and output escaping. It allows unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page, but only when the Email Confirmation feature is enabled.

Defensive priority

Defenders should prioritize verifying the presence of this vulnerability in their WordPress installations, especially if the Email Confirmation feature is enabled, and update or patch the User Profile Builder plugin to a version that addresses this issue.

Recommended defensive actions

• Verify the version of the User Profile Builder plugin in use and update to a patched version if necessary.
• Review WordPress installations for the presence of the Email Confirmation feature and assess exposure.
• Implement additional security measures to monitor and protect against cross-site scripting attacks.
• 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.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, including its description, CVSS score, and references to source code and analysis from [email protected]. Evidence is limited to CVE and NVD records. Defenders should verify if their WordPress installations are using a vulnerable version of the User Profile Builder plugin and the Email Confirmation feature is enabled. Limited evidence suggests that attackers could inject malicious scripts, potentially leading to unauthorized actions or data exposure. The

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.