How severe is CVE-2026-39478?

CVE-2026-39478 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-39478 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-39478?

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.

Does CVE-2026-39478 have an EU (EUVD) identifier?

Yes. CVE-2026-39478 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36938.

When was CVE-2026-39478 published?

CVE-2026-39478 was published on 2026-06-15 and last updated on 2026-06-17.

CVE-2026-39478

CVE-2026-39478 is a high-severity vulnerability with a CVSS 3.x base score of 8.8. 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-502.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36938
Weakness: CWE-502
Published: 2026-06-15
Last modified: 2026-06-17

Description

Contributor PHP Object Injection in Anti-Malware Security and Brute-Force Firewall <= 4.23.87 versions.

Frequently asked questions

What is CVE-2026-39478?: Contributor PHP Object Injection in Anti-Malware Security and Brute-Force Firewall <= 4.23.87 versions.
How severe is CVE-2026-39478?: CVE-2026-39478 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-39478 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-39478?: 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.
Does CVE-2026-39478 have an EU (EUVD) identifier?: Yes. CVE-2026-39478 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36938.
When was CVE-2026-39478 published?: CVE-2026-39478 was published on 2026-06-15 and last updated on 2026-06-17.

References

https://patchstack.com/database/wordpress/plugin/gotmls/vulnerability/wordpress-anti-malware-security-and-brute-force-firewall-plugin-4-23-87-php-object-injection-vulnerability?_s_id=cve

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