CVE-2025-28918 in Featured Image Thumbnail Grid Plugin
Summary
by MITRE • 03/12/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in A. Jones Featured Image Thumbnail Grid allows Stored XSS. This issue affects Featured Image Thumbnail Grid: from n/a through 6.6.1.
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Analysis
by VulDB Data Team • 03/12/2025
This vulnerability represents a critical cross-site scripting flaw in the A. Jones Featured Image Thumbnail Grid plugin, specifically classified as a stored XSS vulnerability under CWE-79. The issue occurs during web page generation when the plugin fails to properly sanitize user input before incorporating it into dynamically generated HTML content. Attackers can exploit this weakness by injecting malicious scripts through input fields that are subsequently stored and executed whenever the affected page is rendered. The vulnerability affects all versions from the initial release through 6.6.1, indicating a long-standing security gap that has persisted across multiple iterations of the plugin.
The technical implementation of this flaw stems from inadequate input validation and output encoding mechanisms within the plugin's codebase. When users submit content or configuration data through the plugin's interface, the system does not sufficiently neutralize potentially malicious input before storing it in the database. This stored data is then retrieved and embedded directly into HTML pages without proper sanitization, creating an ideal environment for XSS attacks. The vulnerability specifically impacts the thumbnail grid functionality where user-generated content is displayed, making it particularly dangerous for websites that rely on user contributions or dynamic content management.
The operational impact of this stored XSS vulnerability is significant and multifaceted. An attacker who successfully exploits this flaw can execute malicious scripts in the context of any user's browser who views the affected pages. This could enable session hijacking, credential theft, redirection to malicious sites, or the execution of arbitrary commands on victim machines. The stored nature of the vulnerability means that once exploited, the malicious payload persists and affects all users who access the compromised pages until the vulnerability is patched. This makes the attack vector particularly insidious as it can remain undetected for extended periods while continuously compromising user sessions and potentially exfiltrating sensitive data.
Organizations using this plugin should immediately implement mitigations including updating to the latest available version where the vulnerability has been addressed. The ATT&CK framework categorizes this type of vulnerability under T1531 - Account Access Token Manipulation and T1059.001 - Command and Scripting Interpreter, as attackers can leverage stored XSS to establish persistent access and execute malicious code. Additional defensive measures include implementing Content Security Policy headers, deploying web application firewalls, and conducting regular security audits of plugin installations. The vulnerability also highlights the importance of input validation and output encoding practices as recommended in OWASP Top Ten and the Open Web Application Security Project guidelines. Security teams should monitor for exploitation attempts and consider implementing automated scanning tools to detect similar vulnerabilities across their web applications and plugins.