CVE-2026-3309 properfraction CVE debrief

Who should care

Administrators and users of WordPress sites utilizing the Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress plugin should be aware of this vulnerability and take necessary actions to protect their sites.

Technical summary

The Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress plugin for WordPress is vulnerable to arbitrary shortcode execution. This is due to the plugin allowing user-supplied billing field values from the checkout process to be interpolated into shortcode template strings that are subsequently processed without proper sanitization of shortcode syntax. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes by submitting crafted billing field values during the checkout process.

Defensive priority

Medium

Recommended defensive actions

• Update the Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress plugin to the latest version.
• Restrict access to the checkout process to authenticated users only.
• Monitor for suspicious activity on the checkout process.
• Implement a web application firewall (WAF) to detect and prevent 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.

Evidence notes

The CVE record was published on 2026-04-04T12:16:03.237Z and was last modified on 2026-07-24T22:10:00.140Z. The NVD entry is currently Deferred. Evidence is limited to public CVE and NVD information. Defenders should verify the vulnerability status of their environments and review official advisories for specific guidance.

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.