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CVE-2026-40752 – Unauthenticated PHP Object Injection – Manufaktur Solutions WordPress Theme ≤ 1.1.1

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Summary

CVE-2026-40752 is a high-severity unauthenticated PHP Object Injection vulnerability (CWE-502: Deserialization of Untrusted Data) in the Manufaktur Solutions WordPress theme by Select-Themes, affecting all versions up to and including 1.1.1. The flaw allows remote, unauthenticated attackers to inject malicious PHP objects over the network with no privileges or user interaction required. If a suitable Property-Oriented Programming (POP) gadget chain is present in the WordPress environment, exploitation can escalate to Remote Code Execution (RCE), resulting in full compromise of confidentiality, integrity, and availability — reflected in the CVSS 3.1 score of 8.1 (High).

Technical details

  • Root cause: Unsafe deserialization of attacker-controlled data within the theme’s codebase (CWE-502). PHP’s unserialize() or WordPress’s maybe_unserialize() processes untrusted input without adequate validation, allowing an attacker to instantiate arbitrary PHP objects.
  • Trigger conditions: The vulnerability is exploitable without authentication and without any victim interaction. Attack complexity is rated High (AC:H), meaning exploitation may require a suitable POP gadget chain to be present in the WordPress installation — for example, within WordPress core, installed plugins, or other installed themes.
  • Attack vector: Network-accessible; the attacker sends a crafted serialized payload via an HTTP request directly to the exposed WordPress site.
  • Potential impact (if a POP gadget chain is available): Remote Code Execution, SQL injection, path traversal, and Denial of Service — with full High impact to confidentiality, integrity, and availability. Without a usable gadget chain, the impact may be more limited, but the risk remains significant given the prevalence of gadget-rich WordPress environments.

Affected software

  • Manufaktur Solutions WordPress theme by Select-Themes — all versions ≤ 1.1.1

Severity

  • CVSS v3.1 Base Score: 8.1 (High)
  • Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate — apply the vendor patch: Update the Manufaktur Solutions theme to version 1.2 or later, which contains the fix for this vulnerability.
  • If immediate patching is not feasible: Restrict public HTTP access to the affected WordPress installation at the network or WAF level until the theme can be updated. Additionally, audit installed plugins and themes for known POP gadget chains that could be leveraged in combination with this vulnerability.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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