What is CVE-2026-56063?

CVE-2026-56063 is a high-severity vulnerability in Bplugins Mailchimp Block, classified under Missing Authorization. CVSS score: 8.3/10. Published 2026-06-26.

How severe is CVE-2026-56063?

High severity. CVSS v3 base score is 8.3 out of 10.

Auth bypass in Bplugins Mailchimp Block

CVE-2026-56063

Unauthenticated Broken Access Control in MailChimp Block <= 1.1.15 versions.

Vulnerability class: Broken Access Control

Published 2026-06-26 · last modified 2026-06-26.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.003 (20.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Bplugins Mailchimp Block

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

patchstack.com/database/wordpress/plugin/block-for-mailchimp/vulnerability/word… (vdb-entry)

Frequently asked questions

What is CVE-2026-56063?: CVE-2026-56063 is a high-severity vulnerability in Bplugins Mailchimp Block, classified under Missing Authorization. CVSS score: 8.3/10. Published 2026-06-26.
How severe is CVE-2026-56063?: High severity. CVSS v3 base score is 8.3 out of 10.