CVE-2026-66583
Critical
Description
Unauthenticated PHP Object Injection in Forminator <= 1.57.0 versions.
SeverityCritical
CVSS9.8
Exploit probability—
ProductForminator
PublishedAug 20, 2026
First seenAug 20, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| WPMU DEV Forminator | v ≤ 1.57.0 | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.