CVE-2025-30771 in WP Cassify Plugin
Summary
by MITRE • 03/27/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Alain-Aymerick FRANCOIS WP Cassify allows DOM-Based XSS. This issue affects WP Cassify: from n/a through 2.3.5.
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Analysis
by VulDB Data Team • 03/27/2025
This vulnerability represents a critical cross-site scripting flaw in the WP Cassify plugin for WordPress, specifically manifesting as a DOM-based XSS attack vector. The issue stems from inadequate input sanitization during web page generation processes, allowing malicious actors to inject malicious scripts into web pages viewed by other users. The vulnerability affects all versions of the plugin from the initial release through version 2.3.5, indicating a long-standing security weakness that has remained unaddressed for an extended period. The DOM-based nature of this XSS vulnerability means that the malicious script is executed within the document object model of the web page rather than being reflected in HTTP responses, making it particularly insidious as it can persist in the browser's DOM structure and execute without requiring server-side modifications.
The technical flaw occurs when user input is improperly handled during the dynamic generation of web pages, creating an opportunity for attackers to inject malicious JavaScript code through carefully crafted inputs. This typically happens when the plugin fails to properly escape or sanitize data before incorporating it into the DOM structure of the web page. The vulnerability allows attackers to execute arbitrary JavaScript code in the context of the victim's browser, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The attack vector specifically targets the DOM manipulation capabilities of the plugin, exploiting the way it processes and renders user-provided data without sufficient validation or sanitization measures.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable sophisticated attacks that compromise the security of entire WordPress installations. Attackers can leverage this vulnerability to establish persistent access to user sessions, potentially gaining administrative privileges if they can target administrators or privileged users. The DOM-based nature means that the malicious payload can be stored and executed across multiple page views, creating a more persistent threat than traditional reflected XSS attacks. This vulnerability particularly affects WordPress sites using the WP Cassify plugin, where users may unknowingly encounter the malicious scripts when browsing pages that utilize the plugin's functionality. The impact is amplified in environments where multiple users interact with the plugin, as each user could become a potential victim or propagation vector for the attack.
Mitigation strategies should focus on immediate plugin updates to versions that address the XSS vulnerability, as well as implementing comprehensive input validation and sanitization measures throughout the application. Organizations should deploy Content Security Policy headers to limit script execution and prevent unauthorized code injection, while also implementing proper output encoding for all dynamic content. The vulnerability aligns with CWE-79, which specifically addresses Cross-Site Scripting flaws, and follows attack patterns described in the ATT&CK framework under TA0001 Initial Access and TA0002 Execution categories. Regular security audits of WordPress plugins should be conducted to identify similar vulnerabilities, and organizations should maintain updated security monitoring to detect potential exploitation attempts. Additionally, implementing web application firewalls and regular penetration testing can help identify and remediate such vulnerabilities before they can be exploited in the wild.