How severe is CVE-2023-4386?

CVE-2023-4386 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-4386 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-4386?

CVE-2023-4386 affects Wpdeveloper Essential Blocks. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-4386?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-4386 published?

CVE-2023-4386 was published on 2023-10-20 and last updated on 2026-06-17.

CVE-2023-4386

CVE-2023-4386 is a high-severity vulnerability in Wpdeveloper Essential Blocks with a CVSS 3.x base score of 8.1. 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-502.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Wpdeveloper Essential Blocks
Published: 2023-10-20
Last modified: 2026-06-17

Description

The Essential Blocks plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.2.0 via deserialization of untrusted input in the get_posts function. This allows unauthenticated attackers to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

Frequently asked questions

What is CVE-2023-4386?: The Essential Blocks plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.2.0 via deserialization of untrusted input in the get_posts function. This allows unauthenticated attackers to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
How severe is CVE-2023-4386?: CVE-2023-4386 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-4386 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-4386?: CVE-2023-4386 affects Wpdeveloper Essential Blocks. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-4386?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-4386 published?: CVE-2023-4386 was published on 2023-10-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wpdeveloper:essential_blocks:*:*:*:*:*:wordpress:*:*

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