CVE-2026-4063 in Social Icons Widget & Block Plugin
Summary
by MITRE • 03/13/2026
The Social Icons Widget & Block by WPZOOM plugin for WordPress is vulnerable to unauthorized data modification due to a missing capability check in the add_menu_item() method hooked to admin_menu in all versions up to, and including, 4.5.8. This is due to the method performing wp_insert_post() and update_post_meta() calls to create a sharing configuration without verifying the current user has administrator-level capabilities. This makes it possible for authenticated attackers, with Subscriber-level access and above, to trigger the creation of a published wpzoom-sharing configuration post with default sharing button settings, which causes social sharing buttons to be automatically injected into all post content on the frontend via the the_content filter.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 03/14/2026
The vulnerability identified as CVE-2026-4063 affects the Social Icons Widget & Block by WPZOOM plugin for WordPress, specifically impacting versions through 4.5.8. This represents a critical authorization flaw that undermines the security model of the WordPress platform by allowing unauthorized data modification through a missing capability check in the plugin's administrative functionality. The vulnerability exists within the add_menu_item() method which is hooked to the admin_menu action, creating a pathway for authenticated attackers to manipulate the plugin's configuration without proper authorization. The flaw stems from the method's implementation of wp_insert_post() and update_post_meta() calls that create a sharing configuration post without verifying that the current user possesses the necessary administrative privileges required for such operations.
The technical execution of this vulnerability occurs when an authenticated attacker with Subscriber-level access or higher triggers the add_menu_item() method, which subsequently creates a published wpzoom-sharing configuration post containing default sharing button settings. This process bypasses the standard WordPress capability checks that should prevent non-administrative users from modifying core plugin configurations. The created sharing configuration post becomes active immediately upon publication, establishing a persistent backdoor that affects all subsequent posts on the WordPress site. The vulnerability leverages the the_content filter to automatically inject social sharing buttons into all post content, effectively enabling the attacker to modify the frontend presentation of content without direct access to the content management system itself.
The operational impact of this vulnerability extends beyond simple data modification to encompass complete control over the social sharing functionality of the WordPress installation. Attackers can manipulate the appearance and behavior of social sharing buttons across the entire website, potentially affecting user experience, brand perception, and even enabling social engineering attacks. The vulnerability creates a persistent modification point that remains active until the malicious configuration is manually removed, making it particularly dangerous for long-term compromise. This type of vulnerability falls under CWE-863, which specifically addresses "Incorrect Authorization," and aligns with ATT&CK technique T1078.004 for Valid Accounts, as it allows privilege escalation through legitimate user accounts with minimal elevation required.
Mitigation strategies for this vulnerability should include immediate plugin updates to versions that address the missing capability check, as well as implementing additional security measures such as role-based access controls and monitoring for unauthorized configuration changes. Administrators should also consider implementing web application firewalls to detect and block suspicious requests targeting the vulnerable plugin endpoints. The vulnerability demonstrates the critical importance of capability verification in WordPress plugin development, particularly for methods that perform data modification operations. Security teams should conduct comprehensive audits of all active plugins to identify similar authorization flaws and implement proper input validation and capability checks throughout the application stack. Regular security assessments and vulnerability scanning should be implemented to identify and remediate such issues before they can be exploited by malicious actors in the wild.