CVE-2026-93878 in Carousel Plugin
Summary
by MITRE • 10/20/2026
The DiviGear Carousel plugin for WordPress is vulnerable to Stored Cross-Site Scripting via update_license AJAX Action in all versions up to, and including, 5.2.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload executes when an administrator visits the DiviGear > Activation settings page, where the unsanitized stored value is echoed unescaped into a single-quoted HTML value attribute.
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Analysis
by VulDB Data Team • 10/20/2026
The vulnerability identified within the DiviGear Carousel plugin for WordPress represents a significant security risk due to its classification as a Stored Cross-Site Scripting flaw. This specific weakness exists in all versions of the plugin up through and including version 5.2.0. The root cause lies in insufficient input sanitization and output escaping mechanisms during the execution of the update_license AJAX action. Unlike reflected XSS, where malicious scripts are executed immediately within a victim's browser via a crafted link, stored vulnerabilities persist on the target server. In this case, the attacker injects arbitrary web scripts that remain embedded in the application's database or configuration files until they are retrieved and rendered by legitimate users.
The operational impact of this vulnerability is particularly severe because it requires only subscriber-level access or higher for exploitation. This low privilege threshold means that a wide range of registered users on a WordPress site can potentially act as attackers. Once an attacker with these minimal credentials successfully injects the malicious payload, the script remains dormant until triggered by another user. Specifically, the injection executes when an administrator visits the DiviGear > Activation settings page. At this point, the unsanitized stored value is echoed unescaped directly into a single-quoted HTML value attribute within the browser context of the administrator's session.
This execution vector allows for high-impact attacks against privileged accounts. Since administrators typically possess full control over the WordPress installation, successful exploitation can lead to complete site compromise. Attackers may use this access to deface websites, steal administrative credentials through keylogging or cookie theft, install further malware such as web shells, or pivot into other parts of the network infrastructure. The fact that the payload is stored means it affects every administrator who views the settings page, potentially compromising multiple accounts if not addressed promptly.
From a classification perspective, this vulnerability aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. More specifically, because the malicious script is stored in the application and executed later upon retrieval, it falls under CWE-834: Excessive Iterative Restriction or CWE-20 depending on whether the focus is on input validation failure or output encoding omission, though generally categorized broadly under Stored XSS patterns. In terms of adversary tactics, this aligns with MITRE ATT&CK technique T1059, Command and Scripting Interpreter, specifically JavaScript execution within a browser environment, which facilitates initial access and potentially credential harvesting as part of the Initial Access or Collection phases depending on the payload's intent.
Mitigation strategies must focus on immediate remediation through software updates. Administrators should upgrade the DiviGear Carousel plugin to a version newer than 5.2.0 where these sanitization issues have been addressed by the developers. If an update is not immediately available, temporary mitigations include restricting user registration or elevating the minimum required capability for accessing the activation settings page if possible within the WordPress role architecture. Additionally, implementing Content Security Policy headers can help mitigate the impact of any remaining XSS vulnerabilities by restricting the sources from which scripts are allowed to execute. Regular security audits and code reviews focusing on input validation and output encoding practices are essential to prevent similar flaws in future plugin versions or custom developments.