CVE-2026-6431 cozmoslabs CVE debrief

Who should care

Defenders responsible for WordPress installations with the User Profile Builder plugin should assess exposure and prioritize verification and remediation. This includes reviewing compensating controls for exposed systems, checking relevant monitoring, detection, and logs for exposed assets, and tracking exceptions and retesting remediated assets.

Why it matters

The User Profile Builder plugin for WordPress has a Stored Cross-Site Scripting vulnerability, allowing unauthenticated attackers to inject web scripts. Defenders should prioritize verification and remediation to prevent exploitation.

• Unauthenticated attackers can inject web scripts that execute when a user accesses an injected page
• Defenders must verify and update the User Profile Builder plugin to prevent exploitation
• Cross-site scripting attacks can lead to unauthorized actions or data exposure

Technical summary

The User Profile Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'Biographical Info' meta field parameter in all versions up to, and including, 3.15.7. This is due to insufficient input sanitization and output escaping, allowing unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability was reported by [email protected] and is documented in the CVE Program record and NVD vulnerability detail pages.

Defensive priority

Defenders should prioritize verifying and updating the User Profile Builder plugin to prevent exploitation.

Recommended defensive actions

• Verify the User Profile Builder plugin version and update to a patched version if necessary
• Monitor for suspicious activity related to the 'Biographical Info' meta field parameter
• Implement additional security measures to prevent cross-site scripting attacks
• 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 vulnerability was reported by [email protected] and is documented in the CVE Program record and NVD vulnerability detail pages. The CVE record was published on 2026-09-07T13:20:36.653Z and has not been modified since then. The vulnerability affects all versions up to, and including, 3.15.7 of the User Profile Builder plugin. The source of this information is the CVE Program record and NVD vulnerability detail pages.

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.