Strategic Overview
- Status
- Patched in 3.7.1.6
- Affected Version
< 3.7.1.6- CVSS
- 8.1High
- Weakness type
- CWE-287 · Improper Authentication
- CVE
CVE-2021-24647
At a glance
CVE-2021-24647 is a high-severity Improper Authentication vulnerability in the Pie Register WordPress plugin, affecting versions < 3.7.1.6. It carries a CVSS score of 8.1 (reachable over the network; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 3.7.1.6; sites on affected versions should update now. Disclosed October 2021, reported by AyeCode Ltd.
Vulnerability Overview
The Registration Forms User profile, Content Restriction, Spam Protection, Payment Gateways, Invitation Codes WordPress plugin before 3.1.7.6 has a flaw in the social login implementation, allowing unauthenticated attacker to login as any user on the site by only knowing their user ID or username
Technical Analysis
The vector marks this flaw as remotely reachable over the network, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.
CWE-287: Improper Authentication
Reaching this weakness in Pie Register < 3.7.1.6 takes a caller who can reach the endpoint. Improper authentication means the mechanism that proves who a caller is can be satisfied without the secret it was supposed to require.
An attacker authenticates as another user — administrators included — without ever knowing a password, so password policies and login rate limits never come into play. For Pie Register the fix is 3.7.1.6: builds < 3.7.1.6 are affected, anything from 3.7.1.6 onward is not.
Remediation
Update to version 3.7.1.6, or a newer patched version
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Pie Register 3.7.1.6 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Pie Register – User Registration, Profiles & Content Restriction
- 9.8CVE-2024-27957: Pie Register <= 3.8.3.2 Arbitrary File Upload
CVE-2024-27957 - 9.8CVE-2025-34077: Pie Register <= 3.7.1.4 Authentication Bypass
CVE-2025-34077 - 9.8CVE-2021-24731: Pie Register <= 3.7.1.5 SQL Injection
CVE-2021-24731 - 9.8CVE-2019-15659: Pie Register SQL Injection
CVE-2019-15659 - 9.8CVE-2018-10969: Pie Register <= 3.0.9 SQL Injection
CVE-2018-10969 - 9.8Registration Forms Authentication Bypass
- 9.8Pie Register 2.0.14-2.0.15 SQL Injection
- 8.8CVE-2024-6069: Pie Register - Basic Authenticated (Subscriber+)
CVE-2024-6069
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