CVE-2025-12512 in GenerateBlocks Plugin
Summary
by MITRE • 12/13/2025
The GenerateBlocks plugin for WordPress is vulnerable to information exposure due to missing object-level authorization checks in versions up to, and including, 2.1.2. This is due to the plugin registering multiple REST API routes under `generateblocks/v1/meta/` that gate access with `current_user_can('edit_posts')`, which is granted to low-privileged roles such as Contributor. The handlers accept arbitrary entity IDs (user IDs, post IDs, etc.) and meta keys, returning any requested metadata with only a short blacklist of password-like keys for protection. There is no object-level authorization ensuring the caller is requesting only their own data, and there is no allowlist of safe keys. This makes it possible for authenticated attackers, with Contributor-level access and above, to exfiltrate personally identifiable information (PII) and other sensitive profile data of administrator accounts or any other users by directly querying user meta keys via the exposed endpoints via the `get_user_meta_rest` function. In typical WordPress + WooCommerce setups, this includes names, email, phone, and address fields that WooCommerce stores in user meta, enabling targeted phishing, account takeover pretexting, and privacy breaches.
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Analysis
by VulDB Data Team • 12/13/2025
The vulnerability identified as CVE-2025-12512 affects the GenerateBlocks plugin for WordPress, specifically versions up to and including 2.1.2, creating a significant information exposure risk through inadequate authorization controls within the plugin's REST API implementation. This flaw resides in the plugin's handling of metadata retrieval operations through the `generateblocks/v1/meta/` endpoint namespace, where multiple REST API routes are registered without proper object-level authorization checks that would normally prevent unauthorized access to data belonging to other users. The vulnerability stems from the plugin's reliance on a permissive capability check that grants access to the `edit_posts` capability, which is mistakenly extended to low-privileged user roles such as Contributors, thereby enabling unauthorized data access that should be restricted to authorized personnel only.
The technical implementation of this vulnerability demonstrates a critical failure in access control design patterns where the plugin's REST API handlers accept arbitrary entity identifiers and meta keys without implementing proper authorization boundaries that would verify whether the requesting user has legitimate access rights to the specific data they are attempting to retrieve. The `get_user_meta_rest` function serves as the primary attack vector, as it processes user meta key requests without validating whether the authenticated user has permission to access the specific metadata being requested. This design flaw creates a direct pathway for authenticated attackers to exploit the system by simply constructing API requests that target specific user IDs and meta keys, bypassing normal WordPress access control mechanisms that would typically prevent such cross-user data access.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass serious privacy and security implications, particularly within typical WordPress environments that integrate WooCommerce and other e-commerce solutions. Attackers with Contributor-level privileges can systematically extract personally identifiable information including names, email addresses, phone numbers, and physical addresses stored in user meta fields, which are commonly used for WooCommerce customer profiles and account management. This exposure creates opportunities for sophisticated social engineering attacks, account takeover attempts, and privacy violations that could lead to significant financial and reputational damage for affected organizations. The vulnerability's exploitation potential is amplified by the fact that these user meta fields often contain sensitive data that attackers can use to craft convincing phishing campaigns or to gain deeper access to compromised accounts.
Mitigation strategies for this vulnerability must address both the immediate security gap in the plugin's implementation and broader architectural concerns around REST API security in WordPress environments. The most effective immediate solution involves updating to a patched version of the GenerateBlocks plugin that implements proper object-level authorization checks, ensuring that API handlers verify not only user authentication but also that the requesting user has legitimate access rights to the specific data they are attempting to retrieve. Organizations should also implement comprehensive monitoring of REST API access patterns to detect anomalous querying behavior that might indicate exploitation attempts. From a design perspective, this vulnerability aligns with CWE-285 (Improper Authorization) and demonstrates ATT&CK technique T1078 (Valid Accounts) where attackers leverage legitimate user privileges to access unauthorized data, highlighting the critical importance of implementing defense-in-depth strategies that go beyond basic authentication to include proper authorization and access control validation at every data access point.
The vulnerability represents a fundamental flaw in the plugin's security architecture that violates core principles of least privilege and object-level access control, making it particularly dangerous in multi-user WordPress environments where different user roles have varying levels of access rights and data sensitivity. Organizations should conduct thorough audits of their WordPress plugin ecosystem to identify similar authorization gaps in other plugins that expose REST API endpoints, as this vulnerability pattern suggests a broader issue with how WordPress plugins handle cross-user data access. The exposure of WooCommerce customer data through this vulnerability particularly emphasizes the need for comprehensive privacy compliance measures and demonstrates how seemingly minor authorization oversights can create significant security risks in e-commerce environments where customer data protection is paramount.