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CVE-2024-13784 – PHP Object Injection (Deserialization) – ARForms (Contact Form, Survey, Quiz & Popu

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Summary

CVE-2024-13784 is a PHP Object Injection vulnerability (CWE-502) in the Contact Form, Survey, Quiz & Popup Form Builder – ARForms plugin for WordPress, affecting all versions up to and including 1.8.5. The plugin deserializes untrusted input submitted through its forms without authentication, allowing an attacker to inject a PHP object into the application. The issue carries a CRITICAL CVSS v3.1 score of 9.8.

Technical details

  • Root cause: the plugin passes untrusted data from form submissions to a PHP deserialization function without validating or sanitizing it.
  • Trigger conditions: an attacker submits a crafted serialized payload through the plugin’s public-facing form submission functionality; no authentication is required.
  • Attack vector: network-based, exploitable via standard HTTP form submission requests to the WordPress site.
  • Impact: by itself, object injection has no direct impact because no exploitable POP (Property-Oriented Programming) chain was identified in the plugin’s own code. However, if another plugin or theme installed on the same WordPress site contains a usable POP chain, exploitation could allow arbitrary file deletion, retrieval of sensitive data, or remote code execution.

Affected software

  • Contact Form, Survey, Quiz & Popup Form Builder – ARForms (WordPress plugin, vendor: reputeinfosystems) — all versions up to and including 1.8.5.

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No vendor-confirmed patched version has been identified for this vulnerability at time of writing; check with the plugin vendor (reputeinfosystems) for an updated release addressing CVE-2024-13784 and upgrade immediately once available.
  • If no patch is available: Disable or remove the ARForms plugin if it is not actively required. Audit the site for other installed plugins or themes that could supply an exploitable POP chain, as this vulnerability has no impact in isolation. Deploy a web application firewall rule to detect and block serialized PHP object payloads (e.g., strings beginning with O:, a:, or s: patterns typical of PHP serialization) submitted through public form fields. Monitor form submission endpoints for anomalous or malformed input.

References

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