CVE-2021-4388: The Opal Estate plugin for WordPress is vulnerable to featured property modifications in versions up to, and i

Q: How do I fix CVE-2021-4388?

opal estate: upgrade to newer than 1.6.11. Exact commands for each OS are on this page.

Q: Is CVE-2021-4388 being exploited?

CVE-2021-4388 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-2021-4388 affect?

CVE-2021-4388 affects opal estate. Severity is medium (CVSS 4.3). 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

Q: How urgent is CVE-2021-4388?

Priority 34/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADE

CVE-2021-4388 is a medium-severity flaw (CVSS 4.3) affecting opal estate. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-862
Published	2023-07-01
Last modified	2026-06-17

Publisher (CNA): Wordfence · Vendor: wpopal

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-01 05:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

wpopal opal estate UPGRADE

Affected: <= 1.6.11

Fixed in: newer than 1.6.11

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy opal-estate || rpm -q opal-estate || opal-estate --version

2. UPGRADE to newer than 1.6.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade opal-estate

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opal-estate

Note

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

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-2021-4388?

opal estate: upgrade to newer than 1.6.11. Exact commands for each OS are on this page.

Is CVE-2021-4388 being exploited?

CVE-2021-4388 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-2021-4388 affect?

CVE-2021-4388 affects opal estate. Severity is medium (CVSS 4.3). 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

How urgent is CVE-2021-4388?

Priority 34/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2021-4387 MEDIUM 4.3 UPGRADE The Opal Estate plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and includ

References

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