CVE-2021-4388

Name: CVE-2021-4388
Creator: NVD / NIST
Published: 2023-07-01T05:15:15.547+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.73%

Last modified Jun 17, 2026

CVE-2021-4388 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 0.73% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.73%

49.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Wpopal	Opal Estate	<= 1.6.11

References

https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/Exploit, Third Party Advisory
https://plugins.trac.wordpress.org/browser/opal-estate/trunk/inc/ajax-functions.php#L177Not Applicable
https://www.wordfence.com/threat-intel/vulnerabilities/id/5ce729a2-a106-45ab-b96c-cfe75246def7?source=cveThird Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/Exploit, Third Party Advisory
https://plugins.trac.wordpress.org/browser/opal-estate/trunk/inc/ajax-functions.php#L177Not Applicable
https://www.wordfence.com/threat-intel/vulnerabilities/id/5ce729a2-a106-45ab-b96c-cfe75246def7?source=cveThird Party Advisory

Timeline

Published: Jul 1, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4388?

How severe is CVE-2021-4388?

CVE-2021-4388 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4388?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-4388?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST