CVE-2025-69130: PHP Object Injection in Entrepreneur WordPress Booking Theme ≤3.1.3

Technical summary

CVE-2025-69130 is a PHP Object Injection vulnerability (CWE-502) affecting the Entrepreneur theme's subscriber handling logic. The vulnerability stems from inadequate input validation and sanitization of user-supplied data that is passed to PHP's unserialize() function or similar object instantiation methods without sufficient protection. When a subscriber or authenticated user submits specially crafted input, the application deserializes untrusted data, allowing an attacker to instantiate arbitrary PHP objects. If suitable gadget chains exist in the WordPress environment (through installed plugins or the theme itself), this can lead to arbitrary code execution with the privileges of the web server process.

Business impact

Compromise of an affected WordPress site could enable attackers to establish persistent backdoor access, steal sensitive business data, deface content, or repurpose the site for malware distribution. For small business owners relying on booking functionality, site downtime and data loss could disrupt operations and damage customer trust. The low barrier to entry (authenticated user, not admin) significantly expands the attack surface if the site has open registration or loose user management policies.

Affected systems

The Entrepreneur - Booking for Small Businesses WordPress theme is affected in all versions up to and including 3.1.3. This applies to any WordPress installation running this theme with that version or earlier. The vulnerability requires an authenticated user account (e.g., subscriber or contributor role) to exploit, so sites with open registration or casual user accounts are at higher risk than those with strict access controls.

Exploitability

The vulnerability has a CVSS score of 8.8 (HIGH severity) with a network-based attack vector and low complexity. Exploitation requires valid user credentials but does not require administrator access, making it moderately exploitable across affected installations. The attack is not currently tracked as a Known Exploited Vulnerability (KEV) by CISA, suggesting active in-the-wild exploitation has not yet been confirmed at scale; however, the low barrier to entry and high impact mean this should not delay remediation. Successful exploitation depends on the availability of usable gadget chains in the WordPress environment, but given WordPress's ecosystem size, suitable chains are often present.

Remediation

Immediately update the Entrepreneur theme to a version higher than 3.1.3 if available from the theme author. If an update is not yet released, consider disabling user registration or restricting subscriber roles to trusted users only as a temporary mitigation. Audit current users and remove any suspicious or dormant accounts. Review web application firewall (WAF) and runtime protection rules to detect object injection patterns in subscriber input streams.

Patch guidance

Check the Entrepreneur theme developer's repository or WordPress.org theme directory for an updated version. Apply the update through the WordPress admin dashboard (Appearance > Themes > Updates) once available. Verify the applied version meets or exceeds the minimum safe version specified in the vendor advisory. After patching, test booking and subscriber functionality to confirm no regressions. If the vendor has not yet released a patch, monitor the theme's support channels and apply it immediately upon release.

Detection guidance

Monitor web server logs and PHP error logs for unserialize() warnings or exceptions tied to subscriber endpoints. Examine database audit logs for unusual serialized object patterns in subscriber-related fields. Use a WordPress security scanner (e.g., Wordfence, Sucuri) to check for known object injection patterns and vulnerable theme versions. Inspect subscriber creation and update requests for base64-encoded or otherwise obfuscated PHP object notation. If available, use SIEM or endpoint protection tools to flag process execution anomalies originating from the web server user immediately after subscriber submissions.

Why prioritize this

This vulnerability merits urgent priority due to its HIGH CVSS score (8.8), the potential for unauthenticated remote code execution via gadget chain exploitation, and the low administrative overhead required from an attacker. Although KEV status is not yet assigned, the low barriers to exploitation and broad applicability to small business WordPress sites justify immediate action. Delaying patching exposes the business to data exfiltration, ransomware deployment, and operational disruption.

Risk score, explained

The CVSS v3.1 score of 8.8 reflects a network-accessible vulnerability that can be triggered by a low-privilege authenticated user, with no user interaction required. The impact is severe across confidentiality, integrity, and availability—successful exploitation enables arbitrary code execution. The score would be higher (critical) if it were exploitable without authentication; the requirement for valid credentials prevents that, but the ease of obtaining subscriber accounts in many WordPress configurations keeps the practical risk substantial.

Frequently asked questions