CVE-2023-0583 in VK Blocks Plugin
Summary
by MITRE • 06/03/2023
The VK Blocks plugin for WordPress is vulnerable to improper authorization via the REST 'update_vk_blocks_options' function in versions up to, and including, 1.57.0.5. This allows authenticated attackers, with contributor-level permissions or above, to change plugin settings including default icons.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/09/2026
The vulnerability identified as CVE-2023-0583 affects the VK Blocks plugin for WordPress, specifically targeting versions up to and including 1.57.0.5. This represents a critical authorization flaw that undermines the security model of the WordPress ecosystem by allowing attackers with relatively low privileges to manipulate core plugin configurations. The vulnerability resides within the REST API endpoint designated as 'update_vk_blocks_options' which is intended to handle administrative settings updates but fails to properly validate user permissions. The flaw enables authenticated attackers who possess contributor-level access or higher to execute unauthorized modifications to plugin behavior, potentially compromising the integrity of the website's content management systems.
The technical nature of this vulnerability aligns with CWE-863, which addresses improper authorization within software applications. This weakness occurs when a system fails to properly verify that an authenticated user has sufficient privileges to perform a requested operation. In the context of WordPress, this manifests as insufficient access control checks within the plugin's REST API implementation. The vulnerability specifically exploits the lack of proper capability checks before allowing modifications to plugin options, creating a path for privilege escalation through the existing user permission structure. Attackers can leverage this flaw to alter default icons and other plugin settings, potentially affecting the visual presentation and functionality of websites using the affected plugin.
From an operational standpoint, this vulnerability presents significant risks to WordPress administrators and website owners who may not immediately detect unauthorized changes to their plugin configurations. The impact extends beyond simple visual modifications, as changing default icons and plugin settings can affect user experience, website functionality, and potentially create opportunities for further attacks. The fact that this vulnerability requires only contributor-level permissions makes it particularly concerning, as contributors typically have limited access to core system functions and are not expected to be able to modify plugin configurations. This creates an unexpected attack vector that could be exploited to establish persistent modifications or to prepare for more sophisticated attacks by altering the plugin's behavior to mask malicious activities.
Organizations should implement immediate mitigations including updating to the latest version of the VK Blocks plugin where the vulnerability has been addressed through proper access control enforcement. System administrators should also review user permissions to ensure that only trusted administrators have contributor or higher privileges within their WordPress installations. The remediation process should include monitoring for unauthorized changes to plugin configurations and implementing proper audit logging to track modifications to critical system settings. Additionally, security teams should consider implementing network-level controls and API rate limiting to reduce the potential impact of any exploitation attempts. This vulnerability demonstrates the importance of proper access control implementation in WordPress plugins and highlights the need for regular security assessments of third-party software components to prevent unauthorized privilege escalation attacks.