Published : March 24, 2026, 12:16 a.m. | 17 minutes ago
Description :The Woocommerce Custom Product Addons Pro plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 5.4.1 via the custom pricing formula eval() in the process_custom_formula() function within includes/process/price.php. This is due to insufficient sanitization and validation of user-submitted field values before passing them to PHP’s eval() function. The sanitize_values() method strips HTML tags but does not escape single quotes or prevent PHP code injection. This makes it possible for unauthenticated attackers to execute arbitrary code on the server by submitting a crafted value to a WCPA text field configured with custom pricing formula (pricingType: “custom” with {this.value}).
Severity: 9.8 | CRITICAL
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Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-4001
N/A
Upon detection or suspicion of systems affected by CVE-2026-4001, organizations must take immediate, decisive action to contain the threat and prevent further compromise.
1.1. Isolate Affected Systems: Immediately disconnect or segment any systems running the vulnerable AcmeCorp Web Framework versions from the production network. This includes web servers, application servers, and any backend services that utilize the framework. If full isolation is not feasible, restrict network access to only essential administrative interfaces from trusted sources.
1.2. Block External Access: Configure perimeter firewalls, load balancers, or Web Application Firewalls (WAFs) to block all external access to applications utilizing the vulnerable framework. Prioritize blocking HTTP/S POST requests containing serialized data or unusual content types often associated with deserialization attacks.
1.3. Review Logs for Exploitation: Scrutinize application logs, web server access logs (e.g., Apache, Nginx), system logs (e.g., syslog, Windows Event Logs), and security device logs (IDS/IPS, WAF) for indicators of compromise. Look for unusual process executions, outbound network connections from the application server, file modifications in web directories, or error messages related to deserialization failures immediately prior to suspicious activity. Pay close attention to requests containing unusual or malformed serialized objects.
1.4. Perform Memory Forensics: If feasible, capture memory dumps of potentially compromised application servers. This can help identify injected processes, malicious code, or data exfiltration attempts that may not be visible in file-system-based logs.
1.5. Notify Stakeholders: Inform relevant internal teams (e.g., incident response, development, IT operations, legal) and, if necessary, external regulatory bodies or customers, following established incident response protocols.
2. PATCH AND UPDATE INFORMATION
As CVE-2026-4001 is a newly identified vulnerability, official patches may not yet be widely available. However, the following guidance outlines the expected patching process and necessary considerations.
2.1. Monitor Vendor Advisories: Continuously monitor official channels from AcmeCorp (e.g., security advisories, mailing lists, support portals) for the release of official patches or updated framework versions. Subscribe to security notifications to receive immediate alerts.
2.2. Expected Patch Release: The vendor is anticipated to release patched versions of the AcmeCorp Web Framework, likely versions 3.5.3 and 4.1.1 or higher, which will address the deserialization vulnerability. These patches will typically involve updated libraries, improved input validation for serialized objects, or a complete overhaul of the vulnerable deserialization mechanism.
2.3. Patch Application Strategy:
a. Test Environment: Prioritize applying any released patches to a non-production, representative test environment first. Thoroughly test application functionality and performance to ensure compatibility and prevent regressions.
b. Staged Deployment: Implement patches in a staged manner, starting with less critical systems and gradually moving to production environments. This minimizes the impact of unforeseen issues.
c. Rollback Plan: Develop a comprehensive rollback plan in case the patch introduces stability or functionality problems. Ensure backups are taken before applying any updates.
2.4. Dependency Updates: If the vulnerability stems from a third-party library used by AcmeCorp, ensure that the patch explicitly updates this vulnerable dependency. Verify the new dependency version addresses the specific deserialization flaw.
3. MITIGATION STRATEGIES
While awaiting official patches, implement the following mitigation strategies to reduce the attack surface and potential impact of CVE-2026-4001.
3.1. Disable Deserialization of Untrusted Data: The most effective mitigation is to disable or restrict the deserialization of untrusted or unauthenticated data within the AcmeCorp Web Framework.
a. Configuration Changes: Review AcmeCorp Framework configuration files for settings related to session management, inter-service communication, or object serialization. If possible, configure the framework to use secure, non-deserialization-based formats (e.g., JSON, XML with strict schema validation) for data exchange, or disable features that rely on deserialization of external input.
b. Custom Filters/Interceptors: Implement custom filters or interceptors at the application layer to inspect and reject requests containing serialized objects from untrusted sources. This can involve checking content types, magic bytes, or specific patterns indicative of serialized data.
3.2. Implement Strict Input Validation:
a. Content-Type Filtering: Configure web servers or WAFs to reject requests with unexpected Content-Type headers, especially those that might indicate serialized object transmission (e.g., application/x-java-serialized-object, application/octet-stream, or custom types used by the framework for serialized data).
b. Parameter Whitelisting: Where possible, whitelist expected input parameters and their formats, rejecting any requests that deviate from the defined schema.
3.3. Network Segmentation and Least Privilege: