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CVE-2026-73397 – Unauthenticated PHP Object Injection (RCE) – Youzify WordPress Plugin ≤ 1.3.7

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Summary

CVE-2026-73397 is an unauthenticated deserialization of untrusted data (PHP Object Injection) vulnerability in the Youzify WordPress plugin, affecting all versions up to and including 1.3.7. The flaw allows a remote, unauthenticated attacker to submit crafted serialized data that the plugin deserializes without validation, potentially leading to arbitrary code execution, denial of service, or unauthorized access to site logic and the admin panel. It carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The plugin deserializes attacker-supplied data without adequate validation or sanitization (CWE-502: Deserialization of Untrusted Data).
  • Trigger conditions: No authentication or user interaction is required; an attacker only needs network access to a vulnerable, internet-exposed WordPress site running the plugin.
  • Attack vector: Network (remote), low attack complexity, no privileges required.
  • Impact: Successful exploitation can enable PHP object injection leading to arbitrary code execution, denial of service, or manipulation of site logic, with high impact to confidentiality, integrity, and availability.

Affected software

  • Youzify WordPress plugin, versions ≤ 1.3.7

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: As of publication, no official patched version has been released. Site owners should monitor the plugin’s WordPress.org changelog for an update beyond 1.3.7 and apply it as soon as it becomes available.
  • If no patch: Until a fix is released, consider disabling or removing the Youzify plugin on internet-facing WordPress sites, restrict access to the site via a web application firewall to block malicious deserialization payloads, and monitor server logs for unusual POST requests or serialized-data submissions targeting plugin endpoints.

References

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