CVE-2026-40807 in CF7 Views Plugin
Summary
by MITRE • 10/06/2026
Unauthenticated Cross Site Scripting (XSS) in CF7 Views – Complete Entry Management for Contact Form 7 <= 3.2.6 versions.
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified as an unauthenticated cross-site scripting flaw within the CF7 Views plugin, specifically affecting versions up to 3.2.6 of its integration with Contact Form 7, represents a significant security risk for websites relying on these tools for user interaction and data collection. This weakness stems from insufficient input validation and sanitization mechanisms when processing form submissions or view configurations that are exposed to public access without requiring prior authentication. The core technical flaw lies in the application's failure to properly encode special characters within user-supplied data before rendering it back into the browser context, allowing malicious actors to inject executable JavaScript code directly into web pages viewed by other users. This type of vulnerability is classically categorized under CWE-79, which defines Improper Neutralization of Input During Web Page Generation as a common cause for cross-site scripting attacks across various platforms and frameworks.
From an operational perspective, the impact of this unauthenticated XSS vector extends beyond simple defacement or annoyance, potentially leading to severe compromise of user sessions and sensitive data interception. Because the attack does not require authentication, any anonymous visitor can trigger the malicious script simply by interacting with a vulnerable form field or viewing a compromised page that processes tainted input. The injected scripts typically execute in the context of the victim's browser session, granting them access to cookies, local storage tokens, and other credentials stored within that domain. Attackers can leverage this capability to perform actions on behalf of legitimate users, such as changing account settings, initiating financial transactions if applicable, or harvesting personal information submitted through contact forms. This aligns with several tactics in the MITRE ATT&CK framework, particularly T1059 which covers Command and Scripting Interpreter usage for executing arbitrary code within a victim's environment, and T1213 regarding Data from Information Repositories where session tokens are exfiltrated to maintain persistent access or escalate privileges.
The exploitation of this vulnerability often involves crafting specific payloads that bypass basic filtering rules implemented by the plugin developers. These payloads may include event handlers like onerror or onload attached to HTML elements, or script tags embedded within form inputs that trigger when the page renders. Since CF7 Views allows for dynamic rendering of contact forms based on various parameters, an attacker can manipulate these parameters to inject malicious content into the rendered output. The lack of strict Content Security Policy enforcement in many default WordPress configurations further exacerbates this risk by allowing inline scripts to execute without restriction. Consequently, even if some basic sanitization is present, sophisticated attackers can often find ways to bypass it using encoding tricks or alternative DOM properties that are less commonly monitored during input validation processes.
Mitigation strategies for this vulnerability must focus on both immediate remediation and long-term architectural improvements. The most effective solution is to upgrade the CF7 Views plugin and Contact Form 7 to versions where this specific flaw has been patched by the developers, ensuring that proper output encoding functions such as esc_html or wp_kses are applied consistently before any user data is rendered in HTML contexts. Administrators should also implement a Web Application Firewall configured with rulesets designed to detect and block common XSS payloads, providing an additional layer of defense against exploitation attempts while updates are being deployed. Furthermore, enforcing strict Content Security Policy headers can significantly reduce the impact of successful injection by preventing unauthorized script execution from external sources or inline scripts where not explicitly permitted. Regular security audits and code reviews focusing on input validation and output encoding practices are essential to prevent similar vulnerabilities in custom plugins or themes that interact with these popular WordPress components.