CVE-2026-6443
CVE-2026-6443 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. 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-506.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- EPSS exploit prediction: 0% (39th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-23384
- Weakness: CWE-506
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-6443?
- 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 severe is CVE-2026-6443?
- CVE-2026-6443 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-6443 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-6443?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-6443 have an EU (EUVD) identifier?
- Yes. CVE-2026-6443 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23384.
- When was CVE-2026-6443 published?
- CVE-2026-6443 was published on 2026-04-17 and last updated on 2026-06-17.
References
- https://anchor.host/someone-bought-30-wordpress-plugins-and-planted-a-backdoor-in-all-of-them/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2597724a-9a39-4e46-b153-f42366f833ba?source=cve
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