What is the CVSS score of CVE-2025-13851?

CVE-2025-13851 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of PHP are affected by CVE-2025-13851?

An unauthenticated attacker can register administrator accounts on WordPress sites running the vulnerable Buyent Classified plugin, gaining complete control over the website and its data.

How to fix or mitigate CVE-2025-13851?

Within 24 hours: Disable the Buyent Classified plugin immediately and audit all user accounts created in the past 90 days for suspicious administrator accounts. Within 7 days: Deactivate user registration via REST API or implement Web Application Firewall rules to block unauthorized role assignment attempts. Within 30 days: Either migrate to an alternative classified listings solution or wait for vendor patch release and conduct full security review before re-enabling.

PHP CVE-2025-13851

CRITICAL

Improper Privilege Management (CWE-269)

2026-02-19 security@wordfence.com

WordPress Privilege Escalation PHP

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:03 vuln.today

CVE Published

Feb 19, 2026 - 07:17 nvd

CRITICAL 9.8

DescriptionCVE.org

The Buyent Classified plugin for WordPress (bundled with Buyent theme) is vulnerable to privilege escalation via user registration in all versions up to, and including, 1.0.7. This is due to the plugin not validating or restricting the user role during registration via the REST API endpoint. This makes it possible for unauthenticated attackers to register accounts with arbitrary roles, including administrator, by manipulating the _buyent_classified_user_type parameter during the registration process, granting them complete control over the WordPress site.