Security Alert Summary
The Pie Register – User Registration, Profiles & Content Restriction plugin for WordPress has a vulnerability that allows unauthorized modification of data due to a missing capability check in the pie_main() function. An unauthenticated attacker can change registration form status in affected versions.
CVE Details
- CVE ID: CVE-2026-3571
- Affected component: Pie Register – User Registration, Profiles & Content Restriction plugin for WordPress
- Affected versions: All versions up to, and including, 3.8.4.8
- Published: April 4, 2026 at 2:15:59 AM UTC
- Last modified: April 4, 2026 at 2:15:59 AM UTC
- CVSS v3.1: 6.5 (MEDIUM) —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Authentication / Privileges / User interaction: No authentication required; privileges required: none; user interaction: none
- Primary impact: Confidentiality: None; Integrity: Low; Availability: Low
- Weakness (CWE): CWE-862
Technical Details
The vulnerability is caused by a missing capability check on the pie_main() function. Because the function does not verify whether the caller has the required capabilities, it is possible for unauthenticated requests to trigger code paths that modify registration form status. The description identifies only the missing capability check in pie_main() as the root cause.
Impact is limited to modifying registration form status. Based on the provided data, the flaw affects integrity and availability at a low level: an attacker could change whether registration forms are open or closed, which may affect who can register or whether legitimate registration is possible.
How This Could Impact Your Website
Consider a small organization that uses Pie Register to manage signups: the site owner configures registration forms, an internal editor manages content, and an external contractor handles occasional account provisioning. If an unauthenticated attacker changes a registration form status, the site owner might find registrations unexpectedly disabled, or conversely open to automated signups. This can lead to spam account creation, administrative overhead to clean or audit accounts, and temporary disruption to normal onboarding workflows.
The integrity and availability impacts are described as low by the CVSS data, so this is unlikely to result in full site compromise based on the information provided. If you’re unsure whether your site is affected or how to assess your current user roles and plugins, it may be worth having a professional review your setup.
Recommended Actions
- Update the affected plugin as soon as a patched version is available.
- Review and reduce unnecessary user roles, especially contributors and other accounts with elevated capabilities.
- Enforce strong passwords and enable two-factor authentication for editors and administrators.
- Remove unused or unmaintained plugins from your site.
- Monitor site activity and registration logs for unusual behavior, such as sudden changes to registration settings or spikes in new accounts.
If you’d like help reviewing your plugins, user roles, or overall WordPress security posture, our team at Freshy is happy to help.
