Forminator
CVE-2026-66583
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated (PR:N) network form input reaches unsafe deserialization with no user interaction; object injection can yield full C/I/A impact via a gadget chain, though impact is chain-dependent.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Unauthenticated PHP Object Injection in Forminator <= 1.57.0 versions.
AnalysisAI
Unauthenticated PHP Object Injection in the Forminator WordPress plugin (WPMU DEV) affects all versions up to and including 1.57.0, letting remote attackers submit crafted serialized data that is deserialized without validation to potentially achieve arbitrary object instantiation and, with a suitable POP gadget chain, remote code execution. The vulnerability carries a CVSS 9.8 rating with a fully unauthenticated network vector and complete confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a vulnerable Forminator form (version <= 1.57.0) be reachable and accept the input parameter that flows into the unsafe deserialization call; no authentication is needed (PR:N) and no user interaction is required (UI:N), so any public-facing form endpoint is a candidate. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) describes a worst-case remotely exploitable, unauthenticated, low-complexity flaw with full triple impact, yielding a 9.8 base score, and the unauthenticated nature combined with WordPress's large attack surface makes this a genuine priority for exposed installations. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote, unauthenticated attacker locates a public WordPress site running a vulnerable Forminator form, then submits a form request whose input contains a crafted PHP serialized object payload. Because the plugin deserializes this input without validation, the attacker-supplied objects are instantiated and, if a compatible gadget chain exists in the site's loaded classes, magic methods are triggered to escalate toward file manipulation or code execution. … |
| Remediation | Upgrade Forminator to the vendor's fixed release above 1.57.0 as soon as it is available; the exact patched version is not confirmed in the provided data, so consult the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/forminator/vulnerability/wordpress-forminator-plugin-1-57-0-php-object-injection-vulnerability) and the WPMU DEV changelog for the specific fixed version before deploying. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all WordPress installations to identify those running Forminator plugin version 1.57.0 or earlier and prioritize internet-facing instances for immediate action. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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