How severe is CVE-2026-27366?

CVE-2026-27366 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-27366 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-27366?

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-2026-27366 have an EU (EUVD) identifier?

Yes. CVE-2026-27366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39362.

When was CVE-2026-27366 published?

CVE-2026-27366 was published on 2026-06-25 and last updated on 2026-06-29.

CVE-2026-27366

CVE-2026-27366 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. 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-862.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39362
Weakness: CWE-862
Published: 2026-06-25
Last modified: 2026-06-29

Description

Unauthenticated Broken Access Control in MainWP Child <= 6.1.1 versions.

Frequently asked questions

What is CVE-2026-27366?: Unauthenticated Broken Access Control in MainWP Child <= 6.1.1 versions.
How severe is CVE-2026-27366?: CVE-2026-27366 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-27366 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-27366?: 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-2026-27366 have an EU (EUVD) identifier?: Yes. CVE-2026-27366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39362.
When was CVE-2026-27366 published?: CVE-2026-27366 was published on 2026-06-25 and last updated on 2026-06-29.

References

https://patchstack.com/database/wordpress/plugin/mainwp-child/vulnerability/wordpress-mainwp-child-plugin-6-1-1-broken-access-control-vulnerability?_s_id=cve

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