CVE-2026-95866 cozmoslabs CVE debrief

Who should care

Defenders responsible for WordPress installations with the User Profile Builder plugin should assess exposure and prioritize updates to mitigate the risk of cross-site scripting attacks.

Why it matters

The User Profile Builder plugin for WordPress has a Stored Cross-Site Scripting vulnerability via the Avatar Field, allowing unauthenticated attackers to inject web scripts. Defenders should prioritize updates and monitor for suspicious activity.

• Unauthenticated attackers can inject web scripts that execute when a user accesses an injected page
• Administrators viewing affected accounts may be exposed to cross-site scripting attacks
• The vulnerability allows for potential compromise of user profiles and avatar data

Technical summary

The User Profile Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Avatar Field in all versions up to, and including, 4.0.2. The vulnerability exists in the wppb_save_avatar_value() function, which writes raw request values to user meta, bypassing validation. The stored payload is later rendered unescaped by wppb_default_fields_make_upload_button() when an administrator views the affected account. This allows unauthenticated attackers to inject web scripts that execute when a user accesses an injected page. The vulnerability allows for potential compromise of user profiles and avatar data.

Defensive priority

Defenders should prioritize updating the User Profile Builder plugin to a version beyond 4.0.2 and monitor for suspicious avatar uploads or user profile modifications.

Recommended defensive actions

• Update the User Profile Builder plugin to a version beyond 4.0.2
• Monitor for suspicious avatar uploads or user profile modifications
• Implement additional security measures to detect and 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 exists in the wppb_save_avatar_value() function, which writes raw request values to user meta, bypassing validation. The stored payload is later rendered unescaped by wppb_default_fields_make_upload_button() when an administrator views the affected account.

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.