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

Q: How do I fix CVE-2021-4387?

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

Q: Is CVE-2021-4387 being exploited?

CVE-2021-4387 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-2021-4387 affect?

CVE-2021-4387 affects opal estate. Severity is medium (CVSS 4.3). The Opal Estate plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.6.11. This is due to missing or incorrect nonce validation on the opalestate_set_feature_property() and opalestate_remove_f

Q: How urgent is CVE-2021-4387?

Priority 32/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADE

CVE-2021-4387 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 Cross-Site Request Forgery in versions up to, and including, 1.6.11. This is due to missing or incorrect nonce validation 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 via a forged request granted they can trick a site administrator into performing an action

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	None
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-352
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 04:15 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-2021-4387?

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

Is CVE-2021-4387 being exploited?

CVE-2021-4387 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-2021-4387 affect?

CVE-2021-4387 affects opal estate. Severity is medium (CVSS 4.3). The Opal Estate plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.6.11. This is due to missing or incorrect nonce validation on the opalestate_set_feature_property() and opalestate_remove_f

How urgent is CVE-2021-4387?

Priority 32/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2021-4388 MEDIUM 4.3 UPGRADE The Opal Estate plugin for WordPress is vulnerable to featured property modifications in versions up to, and i

References

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