CVE-2025-67909: 
WordPress vulnerability analysis and mitigation

CVE-2025-67909 is an Insecure Direct Object Reference (IDOR) / Authorization Bypass Through User-Controlled Key vulnerability in the WP Swings "Membership For WooCommerce" WordPress plugin. It affects all versions up to and including 3.0.3, and was reported by researcher timomangcut on April 30, 2025, then publicly disclosed on December 24, 2025. The vulnerability was assigned a CVSS v3.1 base score of 8.1 (High) by NVD, while Patchstack rates it 7.5 (High) (Patchstack, Red Hat CVE).

The vulnerability is classified as CWE-639 (Authorization Bypass Through User-Controlled Key), corresponding to OWASP Top 10 category A1: Broken Access Control. The flaw arises from incorrectly configured access control security levels within the plugin, allowing an attacker to manipulate user-controlled object references (e.g., membership record IDs) to access or modify resources belonging to other users without proper authorization checks. Exploitation requires only low-level authenticated access per NVD's CVSS vector, though Patchstack notes the required privilege as "Unauthenticated," suggesting the access control gap may be reachable without authentication in some contexts (Patchstack, Red Hat CVE).

Successful exploitation can result in high confidentiality and high integrity impact, with no availability impact. An attacker can access sensitive user membership data, modify or manipulate membership records, and bypass intended access controls within the WooCommerce environment. This could expose personally identifiable information (PII) of members, allow unauthorized privilege escalation within the membership system, and enable mass exploitation across WordPress sites running the vulnerable plugin (Patchstack).

There is no public proof-of-concept exploit code and no confirmed in-the-wild exploitation reported at this time. The EPSS score is approximately 0.028% (0.000280), indicating a low current probability of exploitation. The vulnerability is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog. However, Patchstack classifies it as high priority and notes that IDOR vulnerabilities of this type are commonly used in mass-exploit campaigns targeting WordPress sites at scale (Patchstack, Red Hat CVE).

1. Reconnaissance: Identify WordPress sites running the "Membership For WooCommerce" plugin version 3.0.3 or earlier using tools like WPScan, Shodan, or by inspecting plugin metadata in publicly accessible WordPress installations.
2. Access the vulnerable endpoint: Navigate to or send HTTP requests to plugin endpoints that handle membership record lookups, using predictable or enumerable object identifiers (e.g., membership IDs, user IDs, or order IDs).
3. Manipulate the object reference: Modify the user-controlled key (e.g., change a membership ID parameter in the request from your own ID to another user's ID) to reference a resource belonging to a different user.
4. Bypass authorization: Due to missing or misconfigured server-side authorization checks, the plugin returns or modifies the targeted resource without verifying ownership, granting access to another user's membership data or allowing unauthorized modification.
5. Exfiltrate or manipulate data: Extract sensitive membership information (PII, subscription status, payment details) or alter membership records to escalate privileges or gain unauthorized access to premium content (Patchstack).

• Network: Unusual HTTP GET or POST requests to WooCommerce/membership plugin endpoints with sequential or enumerated object IDs (e.g., membership IDs, user IDs) originating from a single IP or user account in a short time window.
• Logs: WordPress access logs showing repeated requests to membership-related endpoints with varying ID parameters from the same session or IP; unexpected access to membership records not associated with the authenticated user.
• Application: Unexpected changes to membership status, subscription levels, or user roles in the WooCommerce database; access to premium content by accounts that have not paid or enrolled.
• Database: Queries to membership tables referencing user records inconsistent with the requesting user's session identity (Patchstack).

Update the "Membership For WooCommerce" plugin to version 3.0.4 or later, which contains the patch for this vulnerability. Patchstack has also issued a virtual patching/mitigation rule for its subscribers to block exploitation attempts until the plugin is updated. Additionally, administrators should review user roles and permissions, implement the principle of least privilege, and monitor for unauthorized access or suspicious membership record activity (Patchstack).

Patchstack, which coordinated the disclosure, classifies this as a high-priority vulnerability and warns that IDOR vulnerabilities of this class are frequently leveraged in mass-exploit campaigns targeting WordPress plugins regardless of site popularity or traffic. The vulnerability was reported through Patchstack's VDP program by researcher timomangcut and disclosed publicly on December 24, 2025. No significant broader media coverage or notable researcher commentary beyond Patchstack's advisory has been identified (Patchstack).