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CVE-2021-4388

17
FAUCET Score

CVE-2021-4388 describes a missing capability check vulnerability in the Opal Estate plugin for WordPress, affecting versions up to and including 1.6.11. This flaw allows unauthenticated attackers to set or remove featured properties on a website. Rated as Medium severity (CVSS 5.3), the vulnerability has a low impact on integrity and requires no user interaction. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.6.11CPE matchmatch criteria
cpe:2.3:a:wpopal:opal_estate:*:*:*:*:*:wordpress:*:*
>= 0, <= 1.6.11CPE match
cpe:2.3:a:wpopal:opal_estate:*:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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 Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.73%
Probability of exploitation in next 30 days
EPSS Percentile
50.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0073 is in the 32nd percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.nintechnet.com / multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5
ExploitThird Party Advisory
plugins.trac.wordpress.org / browser/opal-estate/trunk/inc/ajax-functions.php
Not Applicable
wordfence.com / threat-intel/vulnerabilities/id/5ce729a2-a106-45ab-b96c-cfe75246def7
Third Party Advisory