CVE-2026-6443
CRITICALDescription
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.
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.
TridentStack Control tracks known vulnerabilities across your Windows, macOS, and Linux fleet and shows the fix as soon as one is published. See how it works
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 40% of all known CVEs.
References
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-2025-30066 | High | 8.6 | 72% | KEV | - |
| CVE-2026-33634 | High | 8.8 | 59% | KEV | Fix |
| 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 | - |
Common questions
How do I fix 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.
Is CVE-2026-6443 being actively exploited?
Not that we know of. CVE-2026-6443 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.50% is the estimated probability that it will be exploited in the next 30 days. That is higher than 40% of all scored CVEs.
How severe is CVE-2026-6443?
CVE-2026-6443 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
Embed a live status badge for CVE-2026-6443
Markdown
[](https://tridentstack.com/cve/CVE-2026-6443)HTML
<a href="https://tridentstack.com/cve/CVE-2026-6443"><img src="https://tridentstack.com/cve/badge/CVE-2026-6443.svg" alt="CVE-2026-6443"></a>Find and fix vulnerabilities across your fleet
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
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.