CVE-2026-66583

WordPress Forminator plugin <= 1.57.0 - PHP Object Injection vulnerability

Unauthenticated PHP Object Injection in Forminator <= 1.57.0 versions.

We have discovered 74,388 live websites that are affected by CVE-2026-66583.

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Affected Software

Product  Forminator
Category Wordpress Plugins
Vulnerable Domains74,388 live websites (100% of Forminator install base)
Vulnerable Versions
  • from 0 through 1.57
Vulnerable Versions Count156 versions ( 100% of all versions)


Common Weakness Enumeration

CWE-502 Deserialization of Untrusted Data



Details

  • Published - Aug 20, 2026
  • Updated - Aug 20, 2026

Credits

  • Ahmed Hassan | Patchstack Bug Bounty Program (finder)

Website Distribution by Country

Number of websites using CVE-2026-66583
United States23,616 websites


Germany6,174 websites
GB5,226 websites
France5,225 websites
Denmark3,539 websites
Netherlands2,320 websites
Canada2,308 websites
Italy2,183 websites
India2,029 websites
Australia1,884 websites

Website Distribution by TLD

Number of websites using CVE-2026-66583
.com31,230 websites
.org3,967 websites
.de3,654 websites
.co.uk3,275 websites
.dk3,067 websites
.fr2,822 websites
.nl2,113 websites
.com.au1,739 websites
.it1,594 websites
.net1,322 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-66583

Top websites that are affected by CVE-2026-66583. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
********.com United States*,***
********.org United States*,***
***********.dk Denmark*,***
************.org France*,***
*******.com United States*,***
***********.net United States**,***
**************.com United States**,***
********.it Italy**,***
*********.gr Greece**,***
*******.com GB**,***
See full domain list

FAQ

CVE-2026-66583 is Deserialization of Untrusted Data in Forminator
A total of 74,388 websites have been identified as vulnerable to CVE-2026-66583, based on global website indexing conducted by WebTechSurvey.
The Forminator is affected by the CVE-2026-66583 vulnerability.
Forminator versions up to and including 1.57 are vulnerable to CVE-2026-66583.