Authenticated code execution via unrestricted XML-RPC deserialization
Published Sep 20, 2026 · Updated Sep 20, 2026
PHP object injection in WPMU DEV Forminator Forms 1.57.0.7 through 1.57.2 allows remote authenticated users to execute code via XML-RPC. The XML-RPC handler deserializes a request value without restricting instantiable classes, permitting an instantiated class to write an attacker-chosen file. Exploitation requires forms-management permission, which administrators hold by default but sites can assign to lower-privileged roles; successful file placement yields server-side code execution.
Summary
What happened
PHP object injection in WPMU DEV Forminator Forms 1.57.0.7 through 1.57.2 allows remote authenticated users to execute code via XML-RPC. The XML-RPC handler deserializes a request value without restricting instantiable classes, permitting an instantiated class to write an attacker-chosen file. Exploitation requires forms-management permission, which administrators hold by default but sites can assign to lower-privileged roles; successful file placement yields server-side code execution.
The record
- CVE
- CVE-2026-87067
- Published
- Sep 20, 2026
- Updated
- Sep 20, 2026
- Vendor
- WPMU DEV
- Product
- Forminator Forms
- Classifications
- T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 20, 2026CVE publishedPublication date reported by the CVE source.
- Sep 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.57.0.7 <1.57.2.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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