Is CVE-2026-6443 in the CISA KEV catalog?

No. CVE-2026-6443 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-6443?

CVE-2026-6443 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2026-6443?

CVE-2026-6443 has an EPSS score of 0.50% (39th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-6443?

No published fix for CVE-2026-6443 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-6443

CRITICAL

9.8

CVSS v3

NVD

Description

All plugins by Essentialplugin for WordPress are vulnerable to an injected backdoor in various versions. This is due to the plugin being sold to a malicious threat actor that embedded a backdoor in all of the plugin's they acquired. This makes it possible for the threat actor to maintain a persistent backdoor and inject spam into the affected sites.

CWE-506

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.50%probability of exploitation in 30 days

39thpercentile

Low risk: more likely to be exploited than 39% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-506 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3094	Critical	10.0	86%	-	Fix
CVE-2026-33634	High	8.8	60%	KEV	Fix
CVE-2025-30066	High	8.6	41%	KEV	-
CVE-2024-4978	High	8.4	27%	KEV	-
CVE-2025-54313	High	7.5	4.1%	KEV	Fix
CVE-2026-45321	Critical	9.6	2.3%	KEV + Ransom	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-22.