CVE-2025-67619: 
WordPress vulnerability analysis and mitigation

CVE-2025-67619 is a Deserialization of Untrusted Data vulnerability (PHP Object Injection) in the designthemes Kids Heaven WordPress theme (slug: kids-world). It affects all versions of the theme through 3.2 and was disclosed on January 22, 2026, by Patchstack. The vulnerability carries a CVSS v3.1 base score of 8.8 (High), assigned by CISA-ADP (NVD, Patchstack).

The vulnerability is classified as CWE-502 (Deserialization of Untrusted Data) and maps to CAPEC-586 (Object Injection). The Kids Heaven WordPress theme fails to properly validate or sanitize serialized data before passing it to PHP's deserialization functions, allowing an authenticated attacker with low privileges to supply a crafted serialized payload that instantiates arbitrary PHP objects. Depending on the PHP classes available in the application's scope (gadget chains), this object injection can be leveraged to achieve remote code execution, file manipulation, or other high-impact outcomes (NVD, Patchstack).

Successful exploitation grants an authenticated low-privileged attacker full confidentiality, integrity, and availability impact on the affected WordPress installation. An attacker could read sensitive data (e.g., database credentials, user information), modify or delete site content, and disrupt service availability. If a suitable PHP gadget chain exists in the environment, the vulnerability could escalate to remote code execution, enabling lateral movement within the hosting infrastructure (NVD).

As of the time of disclosure, no public proof-of-concept exploit code has been identified and there is no evidence of active in-the-wild exploitation. The EPSS score is approximately 0.024% (0.000240), indicating a low current probability of exploitation in the wild. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation requires at least a low-privileged authenticated account on the WordPress site, which somewhat limits the attack surface (NVD, Patchstack).

1. Reconnaissance: Identify WordPress sites using the Kids Heaven theme (slug: kids-world) version 3.2 or earlier, using tools like WPScan or Shodan with WordPress fingerprinting.
2. Obtain low-privileged access: Register or obtain credentials for a low-privileged WordPress account (e.g., Subscriber role) on the target site.
3. Identify the vulnerable input: Locate the theme functionality that accepts and deserializes user-supplied data (e.g., a form field, cookie, or POST parameter processed by PHP's unserialize()).
4. Craft a malicious serialized payload: Using a PHP gadget chain tool (e.g., PHPGGC), generate a serialized PHP object payload targeting a gadget chain available in the WordPress/theme environment to achieve the desired effect (e.g., remote code execution or file write).
5. Submit the payload: Send the crafted serialized payload to the vulnerable endpoint via an authenticated HTTP request.
6. Trigger deserialization: The theme deserializes the attacker-controlled input, instantiating the malicious object and executing the gadget chain, achieving the attacker's objective (e.g., writing a web shell or executing OS commands) (NVD, Patchstack).

• Network: Unusual authenticated POST requests to WordPress theme endpoints containing serialized PHP data (strings beginning with O:, a:, s: patterns in request bodies or cookies).
• Logs: WordPress or web server access logs showing repeated authenticated requests to theme-specific endpoints with abnormally large or encoded payloads; PHP error logs referencing unexpected class instantiation or __wakeup/__destruct method calls.
• File System: Newly created or modified PHP files in the WordPress theme directory (wp-content/themes/kids-world/) or uploads directory, particularly web shells (e.g., files with .php extension containing eval, base64_decode, or system calls).
• Process: Unexpected child processes spawned by the web server process (e.g., apache2, nginx, php-fpm) such as bash, curl, wget, or python.

No patched version of the Kids Heaven theme has been confirmed as available at the time of disclosure. Site administrators should immediately audit whether the theme is in use and, if so, consider temporarily deactivating it until a patched version (above 3.2) is released by designthemes. As a compensating control, restrict WordPress user registration and limit authenticated access to trusted users only. Implement a Web Application Firewall (WAF) rule to block requests containing serialized PHP object patterns. Monitor the Patchstack advisory for patch availability updates (NVD).

The vulnerability was reported by Wordfence in their weekly WordPress vulnerability report covering January 12–18, 2026, which aggregates newly disclosed WordPress theme and plugin vulnerabilities. No significant independent researcher commentary or broader media coverage has been identified beyond standard vulnerability database entries and aggregator reports.