CVE-2026-27070 in Everest Forms Pro Plugin
Summary
by MITRE • 03/19/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPEverest Everest Forms Pro allows Stored XSS.This issue affects Everest Forms Pro: from n/a through 1.9.10.
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Analysis
by VulDB Data Team • 03/23/2026
This vulnerability represents a critical cross-site scripting flaw that undermines the security integrity of web applications built on the WordPress platform. The issue manifests within WPEverest Everest Forms Pro, a popular form building plugin that enables users to create sophisticated contact forms, surveys, and other data collection mechanisms. The vulnerability specifically occurs during the web page generation process where input validation and sanitization mechanisms fail to properly neutralize malicious user data, creating an avenue for persistent malicious script execution. This type of weakness directly aligns with CWE-79 which categorizes cross-site scripting vulnerabilities as a result of inadequate input handling during web page construction. The vulnerability's impact is amplified by its stored nature, meaning that malicious scripts are not merely reflected in response content but are permanently saved within the application's database or storage mechanisms.
The technical exploitation of this vulnerability occurs when an attacker submits malicious input through form fields that are then stored in the system without proper sanitization. When other users view the affected pages or interact with the stored data, the malicious scripts execute within their browser context, potentially stealing session cookies, performing unauthorized actions, or redirecting users to malicious sites. The stored XSS nature means that even after the initial injection, the malicious code persists and continues to affect users who encounter the compromised content. This vulnerability affects all versions of Everest Forms Pro from the initial release through version 1.9.10, indicating a prolonged period during which the security flaw existed without proper mitigation. The issue particularly impacts web applications that rely on user-generated content processing where form data is displayed back to other users without adequate security controls.
The operational implications of this vulnerability extend beyond simple data corruption or user inconvenience, as it creates potential pathways for complete system compromise. Attackers can leverage stored XSS to perform session hijacking, steal sensitive user information, manipulate form submissions, or even establish persistent backdoors within the application environment. The vulnerability's presence in a form generation tool creates a particularly dangerous attack surface since forms often collect sensitive data such as personal information, financial details, or confidential business data. From an attack framework perspective, this vulnerability maps to multiple ATT&CK techniques including T1566 for social engineering and T1059 for command execution through compromised user interfaces. Organizations relying on this plugin face risks of data breaches, regulatory compliance violations, and reputational damage when such vulnerabilities remain unpatched.
Mitigation strategies for this vulnerability should prioritize immediate patch application to version 1.9.11 or later where the XSS sanitization issues have been addressed. Administrators should implement comprehensive input validation mechanisms that sanitize all user-provided data before storage, particularly focusing on HTML content and JavaScript code. Network security controls including web application firewalls and content security policies can provide additional layers of protection by blocking known malicious patterns and restricting script execution. Regular security auditing of form handling components, input sanitization routines, and user data processing workflows should be conducted to identify similar vulnerabilities. Security monitoring should include detection of anomalous form submission patterns and unexpected script execution within the application environment. Organizations should also consider implementing least privilege principles for form management and regularly review access controls to limit the potential impact of successful exploitation attempts. The remediation process should include thorough testing of patched versions to ensure that legitimate functionality remains intact while malicious code injection is properly prevented.