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CVE-2026-73341 – Unauthenticated PHP Object Injection – RegistrationMagic WordPress Plugin ≤ 6.0.9.7

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Summary

CVE-2026-73341 is a critical unauthenticated PHP Object Injection vulnerability affecting the RegistrationMagic WordPress plugin (developed by Metagauss), impacting all versions up to and including 6.0.9.7. The flaw stems from deserialization of untrusted data (CWE-502) and can be triggered by remote, unauthenticated attackers over the network, carrying a CVSS v3.1 score of 9.8 (Critical).

Technical details

  • Root cause: The plugin deserializes untrusted, attacker-controlled input using PHP’s native deserialization functions without adequate validation, enabling PHP Object Injection (CAPEC-586).
  • Trigger conditions: An unauthenticated attacker can send a crafted request containing a serialized PHP object to a vulnerable plugin endpoint; no authentication or user interaction is required.
  • Attack vector: Network-based (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: If chained with a suitable PHP "gadget chain" present in the WordPress core, another installed plugin, or the theme, object injection can lead to code execution, arbitrary file operations, or other object-oriented exploitation, resulting in full compromise of confidentiality, integrity, and availability (C:H/I:H/A:H).

Affected software

  • RegistrationMagic (Metagauss) — WordPress plugin (custom-registration-form-builder-with-submission-manager)
  • All versions up to and including 6.0.9.7
  • Fixed in version 6.0.9.8

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: Update the RegistrationMagic WordPress plugin to version 6.0.9.8 or later, where the deserialization issue has been fixed.
  • If immediate patching is not possible: Restrict or block public access to the plugin’s endpoints via a web application firewall, and audit the site for other plugins/themes that could provide a PHP object injection gadget chain, since removing those reduces the exploitability of this flaw even before patching.
  • Review WordPress and plugin logs for suspicious POST requests containing serialized PHP data (e.g., strings beginning with O:, a:, or s: patterns typical of PHP serialization) targeting RegistrationMagic endpoints.

References

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