What is the CVSS score of CVE-2021-4388?

CVE-2021-4388 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 0.2%.

Is there a public PoC exploit available for CVE-2021-4388?

Yes, a public proof-of-concept exploit is available for CVE-2021-4388. Prioritise patching immediately. EPSS: 0.2%.

Opal Estate CVE-2021-4388

MEDIUM

Missing Authorization (CWE-862)

2023-07-01 security@wordfence.com

Authentication Bypass WordPress Opal Estate

4.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.3 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

PoC Detected

Apr 08, 2026 - 18:17 vuln.today

Public exploit code

CVE Published

Jul 01, 2023 - 05:15 nvd

MEDIUM 4.3

DescriptionCVE.org

The Opal Estate plugin for WordPress is vulnerable to featured property modifications in versions up to, and including, 1.6.11. This is due to missing capability checks on the opalestate_set_feature_property() and opalestate_remove_feature_property() functions. This makes it possible for unauthenticated attackers to set and remove featured properties.

AnalysisAI

The Opal Estate plugin for WordPress is vulnerable to featured property modifications in versions up to, and including, 1.6.11. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Missing Authorization (CWE-862), which allows attackers to access resources or perform actions without proper authorization checks. The Opal Estate plugin for WordPress is vulnerable to featured property modifications in versions up to, and including, 1.6.11. This is due to missing capability checks on the opalestate_set_feature_property() and opalestate_remove_feature_property() functions. This makes it possible for unauthenticated attackers to set and remove featured properties. Affected products include: Wpopal Opal Estate.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement role-based access control, validate authorization on every request server-side, apply principle of least privilege.