CVE-2023-6326 in Master Slider Plugin
Summary
by MITRE • 03/02/2024
The Master Slider – Responsive Touch Slider plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.9.10. This is due to missing or incorrect nonce validation on the 'process_bulk_action' function. This makes it possible for unauthenticated attackers to duplicate or delete arbitrary sliders via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. CVE-2023-50900 and CVE-2024-6490 may be a duplicate of this issue.
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Analysis
by VulDB Data Team • 04/12/2026
The Master Slider plugin for WordPress represents a widely used tool for creating responsive touch sliders on websites, with version 3.9.10 and earlier containing a critical cross-site request forgery vulnerability that exposes sites to unauthorized administrative actions. This vulnerability stems from inadequate nonce validation within the plugin's 'process_bulk_action' function, which serves as a critical security mechanism for verifying legitimate administrative requests. The absence of proper nonce verification creates a pathway for malicious actors to craft forged requests that appear to originate from authenticated administrators, effectively bypassing WordPress's built-in security protections designed to prevent unauthorized modifications to site content.
The technical flaw manifests specifically in the plugin's handling of bulk action processing where nonce tokens that should validate the authenticity of administrative operations are either completely missing or improperly validated. This weakness allows attackers to manipulate slider configurations through forged requests that target the plugin's administrative endpoints. The vulnerability is particularly dangerous because it does not require authentication to exploit, meaning unauthenticated attackers can leverage social engineering techniques such as phishing emails or compromised websites to trick administrators into executing malicious actions. When an administrator clicks on a malicious link or visits a compromised page, the forged request can duplicate or delete arbitrary sliders without the administrator's knowledge or consent.
The operational impact of this vulnerability extends beyond simple data loss or modification, as it can lead to complete site compromise through unauthorized slider manipulation. Attackers can exploit this weakness to delete critical slider configurations, potentially causing website functionality degradation or complete site breakage. The vulnerability also allows for the duplication of sliders, which can result in unauthorized content injection or the creation of malicious slider configurations that could be used for further attacks. Given that Master Slider is commonly used for important website elements such as home page sliders, product showcases, and featured content, the potential for reputational damage and user experience degradation is significant. The vulnerability affects all versions up to and including 3.9.10, making it a widespread concern for WordPress administrators who may have delayed updating their plugins.
The security implications of this vulnerability align with CWE-352, which specifically addresses Cross-Site Request Forgery issues in software systems, and maps directly to ATT&CK technique T1566.001 for the initial access phase through spearphishing attachments or links. Organizations should immediately implement mitigation strategies including updating to the latest plugin version, implementing additional security layers such as web application firewalls, and conducting thorough security audits of all installed WordPress plugins. Administrative users should also be trained to recognize and avoid suspicious links or attachments that could be used to exploit this vulnerability. The potential for this vulnerability to be exploited in combination with other weaknesses in the WordPress ecosystem makes it crucial for site administrators to maintain comprehensive security hygiene practices, including regular plugin updates, strong access controls, and monitoring for unauthorized administrative activities.