# CVE-2025-4334: Simple User Registration <= 6.3 - Unauthenticated Privilege Escalation

- Exploited (CISA KEV): no
- Published: 2025-06-26
- CVSS: 9.8 CRITICAL (v3.1)
- EPSS: 2.6% (85th percentile)
- CWE: CWE-269

The Simple User Registration plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 6.3. This is due to insufficient restrictions on user meta values that can be supplied during registration. This makes it possible for unauthenticated attackers to register as an administrator.

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

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | No public claim | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2025-12-03 | 160 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### F5

- 2025-12-03 · new · rule 200013139
  > Added: signature 200013139 "Wordpress Simple User Registration Plugin Unauthenticated Privilege Escalation" (Authentication/Authorization Attacks, risk High), systems: PHP, WordPress. References: CVE-2025-4334.
  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: passed (0 of 2 requests blocked), template CVE-2025-4334, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: passed (0 of 2 requests blocked), template CVE-2025-4334, 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-2025-4334 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2025-4334