CVE-2023-1024 in WP Meta SEO Plugin
Summary
by MITRE • 02/28/2023
The WP Meta SEO plugin for WordPress is vulnerable to unauthorized sitemap generation due to a missing capability check on the regenerateSitemaps function in versions up to, and including, 4.5.3. This makes it possible for authenticated attackers with subscriber-level access to generate sitemaps. This vulnerability occurred as a result of the plugin relying on nonce checks as a means of access control, and that nonce being accessible to all authenticated users regardless of role.
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Analysis
by VulDB Data Team • 04/09/2026
The WP Meta SEO plugin vulnerability represents a critical access control flaw that undermines the security posture of WordPress installations. This issue affects versions up to and including 4.5.3, where the plugin fails to implement proper capability checks for the regenerateSitemaps function. The vulnerability stems from the plugin's reliance on nonce validation as the sole access control mechanism, creating a dangerous precedent where authenticated users regardless of their permission level can execute sensitive operations. The flaw allows attackers with minimal privileges such as subscribers to generate sitemaps, which may appear benign but can serve as a stepping stone for more sophisticated attacks. From a cybersecurity perspective, this vulnerability exemplifies poor privilege separation principles and demonstrates how relying solely on nonce validation without proper role-based access controls can lead to unauthorized access to administrative functions.
The technical implementation of this vulnerability occurs at the function level where the regenerateSitemaps endpoint lacks proper capability verification before executing sensitive operations. The plugin's architecture fails to distinguish between different user roles when processing sitemap generation requests, effectively treating all authenticated users equally regardless of their permissions. This design flaw directly violates the principle of least privilege and creates an attack vector that can be exploited by malicious actors who have gained subscriber-level access to a WordPress site. The nonce checks that are implemented provide no meaningful security boundary since they are accessible to all authenticated users, making them ineffective as access control mechanisms. This vulnerability aligns with CWE-284, which describes improper access control, and demonstrates how the absence of proper authorization checks can compromise system security. The flaw also relates to ATT&CK technique T1078.004, which covers valid accounts with elevated privileges, as attackers can leverage low-privilege accounts to perform administrative functions.
The operational impact of this vulnerability extends beyond simple sitemap generation, as it provides attackers with potential reconnaissance capabilities and may enable further exploitation. Sitemaps can reveal internal site structure, content organization, and potentially sensitive information about the website's architecture that could be used in subsequent attacks. Attackers with subscriber access can repeatedly generate sitemaps, potentially exhausting server resources or gathering intelligence about the site's content. This vulnerability can also serve as a precursor to more serious attacks, as it demonstrates that the plugin's access control mechanisms are fundamentally flawed. The ability to generate sitemaps may also expose other potential attack vectors, as sitemaps often contain links to pages that might be vulnerable to other exploits such as cross-site scripting or SQL injection. Organizations running affected versions of the plugin face significant risk, as this vulnerability can be exploited without requiring advanced technical skills or elevated privileges. The impact is particularly severe for sites with large content bases, as the sitemap generation process can consume considerable system resources and potentially reveal sensitive information about content organization.
Mitigation strategies for this vulnerability should focus on immediate remediation through plugin updates to versions that properly implement capability checks. Organizations should ensure that all WordPress installations are running the latest version of the WP Meta SEO plugin, which should include proper access control mechanisms that verify user capabilities before allowing sitemap generation. The implementation should follow established security practices by verifying user roles and permissions before executing administrative functions, ensuring that only users with appropriate privileges can regenerate sitemaps. Additionally, system administrators should consider implementing network-level monitoring to detect unusual sitemap generation patterns that might indicate exploitation attempts. The fix should incorporate proper authentication checks that align with WordPress security standards and ensure that nonces are validated against appropriate user permissions. Organizations should also review their overall WordPress security posture, ensuring that other plugins do not suffer from similar access control flaws. This vulnerability highlights the importance of comprehensive security testing for WordPress plugins and the need for regular security audits to identify and remediate similar issues before they can be exploited by malicious actors.