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CVE-2026-62105 – Unauthenticated PHP Object Injection – ThemeREX Addons WordPress Plugin < 2.45.0

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Summary

CVE-2026-62105 is a critical, unauthenticated PHP Object Injection (Insecure Deserialization) vulnerability in the ThemeREX Addons WordPress plugin, a companion plugin bundled with numerous premium WordPress themes. The flaw affects all plugin versions prior to 2.45.0 and carries a CVSS v3.1 base score of 9.8 (Critical), reflecting that it can be triggered remotely by an unauthenticated attacker with no user interaction.

Technical details

  • Root cause: The plugin passes attacker-controlled input into a PHP deserialization function (CWE-502, Deserialization of Untrusted Data) without adequate validation.
  • Trigger conditions: No authentication or prior access to the WordPress site is required to reach the vulnerable code path.
  • Attack vector: Network — an attacker sends a crafted serialized PHP object to the vulnerable endpoint of a site running the affected plugin.
  • Impact: If a suitable "POP chain" (Property-Oriented Programming chain) exists elsewhere in the site’s loaded code (core, theme, or other plugins), successful exploitation can lead to arbitrary code execution, SQL injection, path traversal, file deletion, or denial of service, resulting in full compromise of confidentiality, integrity, and availability of the affected system.

Affected software

  • ThemeREX Addons WordPress plugin, all versions prior to 2.45.0

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 ThemeREX Addons plugin to version 2.45.0 or later, where the vulnerability has been fixed.
  • If immediate patching is not possible:
    • Restrict or monitor access to WordPress sites bundling ThemeREX Addons until the update can be applied.
    • Deploy a Web Application Firewall (WAF) rule to block requests containing suspicious serialized PHP object payloads.
    • Audit affected sites for signs of compromise (unexpected admin accounts, modified files, unusual outbound requests) since exploitation requires no authentication.

References

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