CVE-2025-4334: The Simple User Registration plugin for WordPress is vulnerable to Privilege Escalation in all versions up to,

Q: How do I fix CVE-2025-4334?

memberhero: upgrade to newer than 6.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-4334 being exploited?

CVE-2025-4334 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-4334 affect?

CVE-2025-4334 affects memberhero. Severity is critical (CVSS 9.8). 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 m

Q: How urgent is CVE-2025-4334?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-4334 is a critical-severity flaw (CVSS 9.8) affecting memberhero. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-269
Published	2025-06-26
Last modified	2026-08-11

Publisher (CNA): Wordfence · Vendor: najeebmedia

Last updated 2026-08-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-06-26 02:15 UTCPublished CVE record published
2026-08-11 14:44 UTCUpdated Record last modified

najeebmedia memberhero UPGRADE

Affected: <= 6.3

Fixed in: newer than 6.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy memberhero || rpm -q memberhero || memberhero --version

2. UPGRADE to newer than 6.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade memberhero

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade memberhero

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Simple User Registration <= 6.3 - Unauthenticated Privilege Escalation

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-4334?

memberhero: upgrade to newer than 6.3. Exact commands for each OS are on this page.

Is CVE-2025-4334 being exploited?

CVE-2025-4334 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-4334 affect?

CVE-2025-4334 affects memberhero. Severity is critical (CVSS 9.8). 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 m

How urgent is CVE-2025-4334?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2024-49604 CRITICAL 9.8 UPGRADE Authentication Bypass Using an Alternate Path or Channel vulnerability in N-Media Simple User Registration wp-

References

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