CVE-2026-97301 in Cool Formkit Lite Plugin
Summary
by MITRE • 09/30/2026
Contributor Cross Site Scripting (XSS) in Cool Formkit Lite <= 2.7.8 versions.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified as Contributor Cross-Site Scripting within the Cool Formkit Lite plugin, affecting versions up to and including 2.7.8, represents a significant security flaw rooted in insufficient input validation and output encoding mechanisms. This specific type of cross-site scripting attack targets users with contributor-level access or lower on WordPress installations where this form-building plugin is active. The core technical issue lies in the application's failure to properly sanitize user-supplied data before rendering it within HTML contexts, allowing an attacker to inject malicious JavaScript code that executes in the context of a victim’s browser session. This flaw typically manifests when a contributor submits content through one of the forms created by the plugin, such as contact forms or comment sections, where their input is subsequently displayed on public-facing pages without adequate filtering against script injection vectors.
From a technical perspective, this vulnerability aligns with CWE-79, which categorizes improper neutralization of input during web page generation known as Cross-site Scripting. The absence of robust encoding for special characters allows the injected scripts to bypass standard browser security policies and execute arbitrary commands within the user's session environment. This execution occurs in the context of the trusted website domain, granting the malicious script access to cookies, local storage, and other sensitive data associated with that site. In many WordPress environments, contributor accounts have limited privileges but are still considered authenticated users or at least active participants on the platform, making them viable vectors for initiating attacks against higher-privileged administrators who view the submitted content.
The operational impact of this vulnerability extends beyond simple defacement or minor nuisance scripts. An attacker can leverage this flaw to perform session hijacking by stealing administrator cookies if an admin views a page containing the malicious payload. This could lead to full compromise of the WordPress installation, allowing the attacker to create new administrative accounts, modify site content, install further malware, or exfiltrate sensitive database information. Additionally, the vulnerability facilitates phishing attacks where users are redirected to fraudulent sites designed to steal credentials from legitimate visitors. The persistence of this threat is heightened because contributor-level access is often granted more freely than administrator privileges, increasing the attack surface and the likelihood that a malicious actor can find an account with sufficient permissions to inject payloads into publicly visible areas.
Mitigation strategies for this vulnerability primarily involve immediate software updates and configuration hardening. Site administrators should upgrade Cool Formkit Lite to version 2.7.9 or later, where developers have implemented proper input sanitization and output encoding techniques such as htmlspecialchars() in PHP contexts to neutralize script tags before they reach the browser. In cases where updating is not immediately feasible due to compatibility concerns with other plugins, temporary workarounds include restricting contributor-level access to trusted individuals only and implementing a Web Application Firewall that can detect and block common XSS patterns in HTTP requests. Furthermore, enabling Content Security Policy headers on the web server can significantly reduce the impact of any successful injection by restricting the sources from which scripts are allowed to load, thereby preventing the execution of unauthorized inline JavaScript even if it is successfully injected into the DOM.
Long-term resilience against such vulnerabilities requires adherence to secure coding practices and regular security audits. Developers should ensure that all user inputs are treated as untrusted data until explicitly validated and sanitized according to their expected format. Implementing strict output encoding based on the context in which the data will be rendered is essential for preventing XSS attacks across different parts of an application. Organizations should also consider integrating automated static analysis tools into their development pipelines to identify such flaws early in the coding process, reducing the risk of deploying vulnerable code into production environments. Regular monitoring and logging of user activities can also aid in detecting anomalous behavior indicative of exploitation attempts, allowing for rapid incident response before significant damage occurs.