How severe is CVE-2021-4388?

CVE-2021-4388 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-4388 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4388?

CVE-2021-4388 affects Wpopal Opal Estate. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-4388?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-4388 published?

CVE-2021-4388 was published on 2023-07-01 and last updated on 2026-06-17.

CVE-2021-4388

CVE-2021-4388 is a medium-severity vulnerability in Wpopal Opal Estate with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Wpopal Opal Estate
Published: 2023-07-01
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-4388?: 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.
How severe is CVE-2021-4388?: CVE-2021-4388 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-4388 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-4388?: CVE-2021-4388 affects Wpopal Opal Estate. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-4388?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-4388 published?: CVE-2021-4388 was published on 2023-07-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wpopal:opal_estate:*:*:*:*:*:wordpress:*:*

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