CVE-2025-15669 in Bit Form Plugin
Summary
by MITRE • 08/01/2026
The Bit Form WordPress plugin before 3.1.4 does not sanitise one of its conversational-form display settings before rendering it on the public-facing form, allowing high-privilege users (such as administrators, who do not hold the unfiltered_html capability on multisite) to store JavaScript that executes in the browser of any visitor who views the form.
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Analysis
by VulDB Data Team • 08/01/2026
The vulnerability identified in the Bit Form WordPress plugin affects versions prior to 3.1.4 and represents a critical cross-site scripting flaw that enables persistent malicious code execution within user browsers. This issue arises from insufficient sanitization of conversational-form display settings before rendering them on public-facing forms, creating an avenue for attackers to inject malicious JavaScript payloads that execute whenever visitors interact with the form. The vulnerability specifically targets high-privilege users who possess administrative capabilities but lack the unfiltered_html capability in multisite environments, indicating a sophisticated attack vector that exploits role-based access control weaknesses.
The technical implementation of this flaw stems from the plugin's failure to properly validate and sanitize user input within its form display configuration parameters. When administrators configure conversational forms through the plugin's interface, certain display settings are stored without adequate sanitization processes, allowing potentially malicious content to persist in the database. This stored content is then rendered directly into HTML output without proper escaping or validation, creating a classic XSS vulnerability where JavaScript code can execute within the context of visiting users' browsers. The vulnerability operates at the presentation layer rather than the data storage level, making it particularly insidious as it requires minimal privileges to exploit.
The operational impact of this vulnerability extends beyond simple script injection, potentially enabling sophisticated attack scenarios including session hijacking, credential theft, and malicious redirection. Attackers can craft forms that execute arbitrary JavaScript code upon form display, which could capture user inputs, steal cookies, redirect users to malicious sites, or even deploy additional malware payloads. The persistent nature of the vulnerability means that once exploited, malicious scripts remain active until the form configuration is modified or the plugin is updated, creating a long-term threat vector. This risk is exacerbated in multisite environments where administrators may not have full privileges but still possess sufficient access to modify form configurations.
Mitigation strategies for this vulnerability require immediate plugin updates to version 3.1.4 or later, which implements proper input sanitization and output escaping mechanisms. Organizations should conduct comprehensive security audits of all WordPress installations to identify potentially compromised forms and remove any malicious code that may have been injected prior to patching. Additional defensive measures include implementing content security policies that restrict script execution within form contexts, monitoring for unauthorized form modifications, and establishing regular vulnerability scanning procedures. This vulnerability aligns with CWE-79 Cross-site Scripting and maps to ATT&CK technique T1566 Phishing, specifically targeting the initial access phase through malicious form injection. Regular patch management processes should be reinforced to prevent similar issues in other WordPress plugins and themes, as this represents a common class of vulnerabilities in content management systems where user input is not properly validated before presentation.