CVE-2026-0609 in Logo Slider Plugin
Summary
by MITRE • 03/21/2026
The Logo Slider – Logo Carousel, Logo Showcase & Client Logo Slider Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the image alt text in all versions up to, and including, 4.9.0 due to insufficient input sanitization and output escaping in the 'logo-slider' shortcode. This makes it possible for authenticated attackers, with author level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 03/27/2026
The vulnerability identified as CVE-2026-0609 affects the Logo Slider plugin for WordPress, specifically targeting versions up to and including 4.9.0. This plugin serves as a logo carousel and showcase solution for WordPress websites, allowing administrators to display client logos in an animated slider format. The security flaw manifests within the plugin's handling of image alt text attributes when processing the 'logo-slider' shortcode, creating a persistent cross-site scripting vector that can be exploited by authenticated attackers with author-level privileges or higher.
The technical implementation of this vulnerability stems from inadequate input sanitization and output escaping mechanisms within the plugin's shortcode processing logic. When administrators or authorized users input image alt text containing malicious script code, the plugin fails to properly sanitize this input before storing it in the database. Subsequently, when the 'logo-slider' shortcode renders the content, the plugin does not adequately escape the stored alt text before outputting it to web pages. This combination of insufficient input validation and output encoding creates a classic stored XSS vulnerability where malicious scripts can be permanently embedded within the plugin's data storage and executed whenever affected pages are rendered.
The operational impact of this vulnerability is significant for WordPress site administrators who rely on the Logo Slider plugin for their client showcase functionality. Attackers with author-level access can inject malicious scripts that execute in the context of any user who views pages containing the compromised slider content. This creates potential for session hijacking, credential theft, defacement of website content, and further exploitation of the compromised user's privileges. The vulnerability is particularly dangerous because it requires minimal privileges to exploit and can affect any user who accesses pages where the malicious content is displayed, making it a persistent threat that can compromise multiple users over time.
Organizations and WordPress administrators should immediately update to the latest version of the Logo Slider plugin where this vulnerability has been addressed through proper input sanitization and output escaping mechanisms. The fix should implement comprehensive validation of all user-supplied input, including image alt text attributes, and ensure that all output is properly escaped according to the context in which it is rendered. This vulnerability aligns with CWE-79, which describes Cross-Site Scripting flaws, and represents a typical example of how insufficient input validation can lead to persistent XSS attacks. From an ATT&CK framework perspective, this vulnerability enables techniques such as credential access and persistence through the execution of malicious scripts in the context of authenticated users, potentially allowing attackers to escalate privileges and maintain access to compromised WordPress installations.