Critical severity · published Aug 20, 2026
CVE-2026-66583
WordPress Forminator plugin <= 1.57.0 - PHP Object Injection vulnerability
9.8
CVSS
0.6%
EPSS
No
On KEV
Description
Unauthenticated PHP Object Injection in Forminator <= 1.57.0 versions.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
Forminator · WPMU DEV
through 1.57.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66583
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-66583
patchstack.com
https://patchstack.com/database/wordpress/plugin/forminator/vulnerability/wordpress-forminator-plugin-1-57-0-php-object-injection-vulnerability?_s_id=cve
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