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CVE-2026-73366 – Unauthenticated PHP Object Injection – Easy Google Maps WordPress Plugin ≤ 1.13.0

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Summary

CVE-2026-73366 is an unauthenticated PHP Object Injection (deserialization of untrusted data) vulnerability in the Easy Google Maps WordPress plugin (google-maps-easy), developed by Supsystic. It affects all plugin versions up to and including 1.13.0 and carries a Critical CVSS v3.1 score of 9.8, as it can be exploited remotely without authentication or user interaction.

Technical details

  • Root cause: the plugin deserializes untrusted, attacker-supplied input using PHP’s native unserialize functionality without adequate validation, classified under CWE-502 (Deserialization of Untrusted Data).
  • Trigger conditions: an attacker submits crafted serialized PHP object data to a plugin endpoint reachable on a vulnerable WordPress installation running the plugin.
  • Attack vector: Network — no authentication and no user interaction are required to exploit the flaw.
  • Impact: successful exploitation can lead to PHP Object Injection, which — depending on other classes ("gadget chains") present on the site — can enable remote code execution, arbitrary file operations, or full compromise of confidentiality, integrity, and availability of the affected WordPress site.

Affected software

  • Easy Google Maps (google-maps-easy) WordPress plugin, versions <= 1.13.0
  • Fixed in version 1.14.0 and later

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 Easy Google Maps plugin to version 1.14.0 or later (current release is 1.14.3, which includes further security hardening).
  • If immediate patching is not possible: disable or deactivate the Easy Google Maps plugin until it can be updated, restrict access to WordPress admin-ajax/REST endpoints exposed by the plugin, and monitor web server logs for unusual POST requests containing serialized PHP object payloads (e.g., strings beginning with O: or a:).

References

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