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Pie Register - SQL Injection (CVE-2021-24731)

CVE-2021-24731

Vulnerability CVE-2021-24731 PLUGIN pie-register CRITICAL

The Registration Forms – User profile, Content Restriction, Spam Protection, Payment Gateways, Invitation Codes WordPress plugin before 3.7.1.6 does not properly escape user data before using it in a SQL statement in the wp-json/pie/v1/login REST API endpoint, leading to an SQL injection.

CVE-2021-24731

CRITICAL CVSS 9.8 Published 2021-11-08 Updated 2026-06-17
AI Risk Critical (90/100) Active Exploit: No strong signal Published Exploit: No public exploit references Priority: P1 Immediate
Severity Band CRITICAL
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Components 2
Reference Links 1
AI Risk Engine Critical (90/100)
Exploitability High
Active Exploitation No strong signal
Published Exploit Status No public exploit references

Threat Timeline

  1. 2021-11-08 CVE published and first recorded in the threat feed.
  2. 2026-06-17 Record updated with latest vulnerability metadata.
  3. 2026-04-11 AI technical context refreshed for mitigation and impact guidance.
  4. Now Monitoring for follow-up changes, linked references, and new related CVEs.

AI Context

Machine-generated threat intelligence

AI Updated 164 days ago

AI enriched 164 days ago (2026-04-11 00:45 UTC)

Technical Summary

The Registration Forms – User profile, Content Restriction, Spam Protection, Payment Gateways, Invitation Codes WordPress plugin before 3.7.1.6 does not properly escape user data before using it in a SQL statement in the wp-json/pie/v1/login REST API endpoint, leading to an SQL injection.

Potential Impact

Severity is CRITICAL (CVSS 9.8). Depending on deployment context, affected components may be exposed to unauthorized actions or data integrity risk.

Exploitability Assessment

Exploitability is assessed as High based on severity and technical exposure profile.

Primary risk drivers: severity and technical exposure profile

Mitigation Recommendations

Validate affected product versions, prioritize patching, and monitor references for vendor remediation guidance. If immediate patching is not possible, apply compensating controls and limit exposure of vulnerable surfaces.

Detection & Monitoring

Track authentication anomalies, unexpected file writes, and suspicious plugin API activity around affected components.

Business Impact Lens

AI risk score 90/100 (Critical, High) with priority P1 Immediate. Prioritize remediation where affected components process customer data, admin sessions, or Internet-exposed workflows.

Affected Products

Pie Register PLUGIN · pie-register Affected: < 3.7.1.6 Fixed in: 3.7.1.6
Registration Forms PLUGIN · registration-forms Affected: < 3.7.1.6 Fixed in: 3.7.1.6

Related Vulnerabilities

Browse All Threats

Newest linked vulnerabilities to keep visitors exploring adjacent CVE coverage.

Pie Register - Security Vulnerability (CVE-2026-10530) CVE-2026-10530 Published 2026-06-22 Pie Register - Broken Access Control (CVE-2026-3571) CVE-2026-3571 Published 2026-04-04 Pie Register - Broken Access Control (CVE-2026-24577) CVE-2026-24577 Published 2026-01-23 Pie Register - Remote Code Execution (CVE-2025-34077) CVE-2025-34077 Published 2025-07-09 Pie Register - Information Disclosure (CVE-2024-13818) CVE-2024-13818 Published 2025-02-21 Pie Register - Broken Access Control (CVE-2024-6069) CVE-2024-6069 Published 2024-07-09

References

What to do about this

Patch immediately Serious, and reachable without meaningful privilege.

Fix it

Update Pie Register to 3.7.1.6 or later.

That is the complete fix. Everything below is what protects you in the meantime.

Cannot update today? Request / payload inspection (WAF) in Hack Halt ProSecure blocks this class of attack before WordPress processes the request.

Inspect request parameters and bodies for injection, traversal and file-inclusion payloads, and refuse the request rather than logging it.

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Not sure if you are affected?

Scan your site to see whether it runs Pie Register, and at which version.

Free, no installation, no account. It reads what your site already publishes, then tells you which plugins carry known vulnerabilities and what to do about each one.

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Am I affected by this vulnerability?

You are affected if your site runs Pie Register. Versions below 3.7.1.6 are vulnerable; that release and later are not.

How do I fix it?

Update Pie Register to version 3.7.1.6 or later. That is the complete fix. Until you can update, Request / payload inspection (WAF) in Hack Halt ProSecure contains this class of attack at the request layer.

What can an attacker actually do?

This is a SQL Injection flaw. An attacker who exploits it can read, alter or delete anything in the site database, including user accounts and password hashes.

WordPress security that blocks attacks before they land.

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