CVE-2026-39070 in Bit Assist Plugin
Summary
by MITRE • 08/28/2026
WordPress plugin (Bit Assist) before 1.7.2 is affected by Stored Cross-Site Scripting in Call-To-Action feature. An authenticated attacker with the privileged role (admin) can exploit this to redirect user to malicious site or control the account.
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Analysis
by VulDB Data Team • 08/28/2026
The vulnerability identified within Bit Assist, specifically prior to version 1.7.2, represents a significant security flaw located within its Call-To-Action feature. This component is designed to allow website administrators to create and manage promotional elements such as banners, pop-ups, or notification bars intended to drive user engagement. However, the implementation fails to adequately sanitize user-supplied input when processing data for these call-to-action modules. The core technical flaw lies in the insufficient validation of special characters within fields that are subsequently rendered directly into HTML without proper encoding. This lack of sanitization creates a classic Stored Cross-Site Scripting vector where malicious scripts can be persistently stored on the server-side database rather than being executed transiently through URL parameters or temporary input fields.
An attacker with administrative privileges, which is typically required to configure such features in WordPress environments, can exploit this weakness by injecting executable JavaScript code into the call-to-action configuration settings. Because the vulnerability is classified as Stored Cross-Site Scripting, the malicious payload remains active on the server and is served to every user who visits a page containing the compromised element. This persistence distinguishes it from reflected XSS attacks and significantly increases its potential impact radius. The attacker does not need to trick an administrator into clicking a specific link; rather, once the configuration is saved with the injected script, any visitor loading that page will have their browser execute the malicious code in the context of the website's domain.
The operational impact of this vulnerability extends beyond simple defacement or session hijacking through cookie theft. While traditional XSS attacks often focus on stealing authentication cookies to take over user accounts, an attacker with admin privileges can leverage this vector for more sophisticated social engineering and phishing campaigns. By controlling the content displayed via the call-to-action feature, the attacker can redirect legitimate users to malicious sites designed to mimic login pages or other critical interfaces. This facilitates credential harvesting against end-users who trust the original site. Furthermore, if the stored script is crafted to perform actions on behalf of the victim user while they are logged into the WordPress dashboard, it could potentially lead to further account compromise or unauthorized modifications to the website content, effectively allowing full control over the administrative interface through client-side manipulation.
From a classification perspective, this vulnerability aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific nature of storing malicious data in a database and serving it to other users places it firmly within the stored variant of this weakness. In terms of adversary tactics, this exploit maps directly to MITRE ATT&CK technique T1059, Command and Scripting Interpreter, specifically JavaScript execution on web browsers. It also relates to T1189 Drive-by Compromise if used for redirecting users to malicious infrastructure, or T1204 User Execution if the goal is to trick administrators into interacting with a crafted payload that triggers further exploitation chains.
Mitigation strategies must prioritize immediate patching of the Bit Assist plugin to version 1.7.2 or later where these input validation issues have been addressed by the developers. Until patches are applied, site administrators should consider disabling the call-to-action feature if it is not actively in use to reduce the attack surface. Additionally, implementing a Web Application Firewall with robust XSS detection rules can provide an additional layer of defense by blocking requests containing known malicious script patterns before they reach the application logic. Long-term remediation involves enforcing strict Content Security Policy headers that restrict inline script execution and ensuring that all future development follows secure coding practices involving rigorous input sanitization and output encoding to prevent similar vulnerabilities in other components of the WordPress ecosystem.