High severity · published Jun 26, 2026
CVE-2026-56063
WordPress MailChimp Block plugin <= 1.1.15 - Broken Access Control vulnerability
8.3
CVSS
0.3%
EPSS
No
On KEV
Description
Unauthenticated Broken Access Control in MailChimp Block <= 1.1.15 versions.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MB
MailChimp Block · bPlugins
through 1.1.15 · source: vendor