CVE-2026-84930 in CatFolders Document Gallery & PDF Library Plugin
Summary
by MITRE • 09/05/2026
The CatFolders Document Gallery & PDF Library WordPress plugin before 2.0.7 does not properly validate a block attribute before using it as an HTML tag name in its gallery output, allowing users with the Author role and above to inject arbitrary web scripts that execute in the browser of anyone who views the affected post.
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Analysis
by VulDB Data Team • 09/05/2026
The vulnerability identified in CatFolders Document Gallery & PDF Library for WordPress prior to version 2.0.7 represents a significant security flaw rooted in insufficient input validation within the plugin's gallery rendering logic. Specifically, the application fails to properly sanitize or validate a block attribute before utilizing its value as an HTML tag name during the generation of gallery output. This technical deficiency allows attackers with Author role privileges and above to manipulate this attribute, effectively injecting arbitrary web scripts into the page structure. When a victim user views a post containing the malicious content, these injected scripts execute within their browser context, leading to a classic Cross-Site Scripting scenario that compromises the integrity of the client-side environment.
From a technical perspective, the core issue lies in the lack of strict type checking and whitelisting for HTML tag names derived from user-supplied input. By allowing an arbitrary string to be interpreted directly as an HTML element name without adequate sanitization, the application creates an injection vector that bypasses standard content security measures. This flaw is categorized under CWE-79, which defines Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific mechanism involves manipulating a block attribute to alter the DOM structure in a way that facilitates script execution, highlighting a failure in input validation protocols that are critical for maintaining web application security boundaries.
The operational impact of this vulnerability is substantial due to its potential for persistent data manipulation and user compromise. Since the attack requires only Author-level access or higher, it targets users who typically have significant control over content creation within WordPress environments. An attacker leveraging this flaw can execute arbitrary JavaScript in the context of any visitor viewing the affected post. This capability enables a range of malicious activities including session hijacking through cookie theft, credential harvesting via fake login forms injected into the page, defacement of the website's appearance to damage reputation, and redirection of users to phishing sites or malware distribution platforms. The persistence of this threat depends on whether the injected content is stored in the database as part of a post or template, potentially affecting multiple visitors over an extended period until remediation occurs.
To mitigate this risk, immediate action must be taken by upgrading the CatFolders Document Gallery & PDF Library plugin to version 2.0.7 or later where these validation checks have been implemented and corrected. Administrators should also enforce strict role-based access control principles ensuring that only trusted individuals with verified credentials are granted Author-level permissions or higher within their WordPress installations. Implementing a Web Application Firewall can provide an additional layer of defense by filtering out malicious payloads before they reach the application logic, although this is not a substitute for patching the underlying code vulnerability. Furthermore, adopting Content Security Policy headers can help mitigate the impact of any successful script injection attempts by restricting the sources from which scripts are allowed to execute in the browser environment.
This incident underscores the importance of rigorous input validation practices in web development, particularly when handling dynamic content generation features like galleries and document libraries. The vulnerability aligns with ATT&CK technique T1059 Command and Scripting Interpreter as it involves executing code within a target system through injected scripts. Security teams should prioritize regular audits of third-party plugins to ensure they adhere to secure coding standards such as those outlined in OWASP guidelines for preventing injection flaws. Continuous monitoring for unusual activity patterns associated with high-privilege user accounts can also aid in the early detection of exploitation attempts before significant damage is inflicted on the organization's digital assets and user base.