CVE-2021-34621
Published: April 11, 2026
Official Description
A vulnerability in the user registration component found in the ~/src/Classes/RegistrationAuth.php file of the ProfilePress WordPress plugin made it possible for users to register on sites as an administrator. This issue affects versions 3.0.0 - 3.1.3. .
Risk Analysis
This vulnerability in the ProfilePress WordPress plugin allows unauthorized users to register as administrators due to a flaw in the registration component. Its inclusion in CISA's KEV indicates active exploitation, making it an urgent security issue.
Active exploitation of this vulnerability has been observed in the wild, indicating a significant and immediate threat.
Upgrade the ProfilePress WordPress plugin to a version beyond 3.1.3 to mitigate the administrator registration vulnerability.
Technical Analysis
CVE-2021-34621 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-34621 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-34621 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1