CVE-2026-40752: Manufaktur Solutions Auth Bypass Flaw

CVE-2026-40752 Overview

CVE-2026-40752 is an unauthenticated PHP Object Injection vulnerability affecting the Manufaktur Solutions WordPress theme in versions up to and including 1.1.1. The flaw stems from insecure deserialization of attacker-controlled input [CWE-502], allowing remote attackers to inject arbitrary PHP objects without authentication. When a suitable POP (Property-Oriented Programming) gadget chain is present in the WordPress instance, exploitation can lead to remote code execution, arbitrary file operations, or full site compromise.

Critical Impact
Unauthenticated attackers can inject PHP objects over the network, potentially achieving code execution and full compromise of confidentiality, integrity, and availability on affected WordPress sites.

Affected Products

Manufaktur Solutions WordPress theme versions <= 1.1.1
WordPress installations using the vulnerable theme
Any site sharing the runtime with PHP classes that form an exploitable gadget chain

Discovery Timeline

2026-06-17 - CVE-2026-40752 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-40752

Vulnerability Analysis

The vulnerability is an instance of Insecure Deserialization [CWE-502] within the Manufaktur Solutions theme. The theme passes untrusted input to PHP's unserialize() function (or an equivalent deserialization path) without validating the data source or restricting allowed classes. Because the entry point is reachable without authentication, any anonymous visitor can deliver a crafted serialized payload to the vulnerable endpoint.

PHP Object Injection becomes exploitable when the application or a loaded plugin defines classes implementing magic methods such as __wakeup(), __destruct(), __toString(), or __call(). Attackers chain these methods into a POP gadget that triggers file writes, SQL queries, or command execution during object instantiation or destruction. Refer to the Patchstack WordPress Vulnerability advisory for advisory-level details.

Root Cause

The root cause is the use of unserialize() on attacker-influenced data inside the theme code. Safe alternatives such as json_decode() or unserialize($data, ['allowed_classes' => false]) were not used, and no signature or integrity check guards the deserialization path.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction, although exploitation complexity is high because a usable gadget chain must exist in the target environment. An attacker submits a crafted serialized PHP object to the vulnerable theme endpoint, the server deserializes it, and the resulting object graph executes attacker-chosen behavior through magic methods.

// Example exploitation pattern (conceptual, no working PoC published)
// Attacker sends a serialized payload to a theme endpoint that calls
// unserialize() on user-controlled input. A gadget chain in a loaded
// plugin/theme triggers code execution via __destruct() or __wakeup().
// See the Patchstack advisory for vendor-confirmed technical details.

Detection Methods for CVE-2026-40752

Indicators of Compromise

HTTP requests to Manufaktur Solutions theme endpoints containing serialized PHP markers such as O:, a:, or s: in parameter values
Unexpected PHP files created under wp-content/uploads/ or theme directories after anonymous requests
New or modified WordPress administrator accounts without corresponding admin login events
Outbound connections from the web server to unfamiliar hosts following requests to the theme

Detection Strategies

Inspect web server and WordPress access logs for request bodies or query strings containing serialized PHP object signatures targeting theme files
Apply WAF rules that flag serialized PHP payloads on unauthenticated endpoints
Use file integrity monitoring on wp-content/themes/manufaktursolutions/ and core WordPress directories to detect tampering

Monitoring Recommendations

Alert on PHP processes spawning shell, curl, wget, or python child processes from the web server user context
Monitor for unexpected writes to PHP files anywhere under wp-content/
Track creation of new privileged WordPress users and changes to the wp_optionsactive_plugins value

How to Mitigate CVE-2026-40752

Immediate Actions Required

Identify all WordPress sites using the Manufaktur Solutions theme at version 1.1.1 or earlier
Deactivate and remove the vulnerable theme until a patched release is confirmed by the vendor
Restrict external access to affected sites with a WAF rule blocking serialized PHP payloads on theme endpoints
Audit administrator accounts, scheduled tasks (wp_cron), and theme/plugin files for signs of compromise

Patch Information

At the time of NVD publication on 2026-06-17, no fixed version is referenced for the Manufaktur Solutions theme. Consult the Patchstack WordPress Vulnerability advisory for the latest remediation guidance and any vendor-released update.

Workarounds

Replace the Manufaktur Solutions theme with a maintained alternative until a vendor fix is published
Configure a WAF or reverse proxy rule to drop requests whose parameters match serialized PHP patterns such as O:\d+: or a:\d+:{
Run PHP with the most recent supported version and reduce the number of loaded plugins to shrink the available gadget surface
Apply least-privilege filesystem permissions so the PHP process cannot write to theme or plugin directories

bash

# Example ModSecurity rule to block serialized PHP object payloads
SecRule ARGS|REQUEST_BODY "@rx (?:^|[=&])(?:O|a|s):\d+:" \
    "id:1040752,phase:2,deny,status:403,\
     msg:'Possible PHP Object Injection payload (CVE-2026-40752)',\
     tag:'CWE-502'"