# CVE-2021-34621: ProfilePress 3.0 - 3.1.3 - Unauthenticated Privilege Escalation

- Exploited (CISA KEV): no
- Published: 2021-07-07
- CVSS: 9.8 CRITICAL (v3.1)
- EPSS: 68.9% (99th percentile)
- CWE: CWE-269

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. .

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | Before feed history | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2025-12-03 | 1610 |
| Akamai | No public source | — | — |
| OWASP CRS | Before feed history | — | — |

### F5

- 2025-12-03 · new · rule 200013141
  > Added: signature 200013141 "WordPress ProfilePress Privilege Escalation" (Authentication/Authorization Attacks, risk Medium), systems: WordPress. References: CVE-2021-34622, CVE-2021-34621.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: partial (1 of 3 requests blocked), template CVE-2021-34621, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: partial (1 of 3 requests blocked), template CVE-2021-34621, 2026-11-02

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2021-34621 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2021-34621