CVE-2024-1328 in Newsletter2Go Plugin
Summary
by MITRE • 03/12/2024
The Newsletter2Go plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘style’ parameter in all versions up to, and including, 4.0.14 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 04/12/2026
The Newsletter2Go plugin for WordPress presents a critical stored cross-site scripting vulnerability identified as CVE-2024-1328 affecting versions through 4.0.14. This vulnerability stems from inadequate input validation and output escaping mechanisms within the plugin's handling of the 'style' parameter, creating a persistent security weakness that can be exploited by authenticated attackers. The flaw specifically targets the plugin's configuration and styling functionality where user-supplied input is not properly sanitized before being stored in the database and subsequently rendered in web pages without adequate escaping.
The technical implementation of this vulnerability allows attackers with subscriber-level privileges or higher to inject malicious scripts into the plugin's styling parameters. When legitimate users access pages containing the injected content, the stored scripts execute in their browsers, potentially leading to session hijacking, credential theft, or further compromise of the affected WordPress installation. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws, and represents a significant risk to the confidentiality and integrity of user data within the WordPress environment. The attack vector is particularly concerning because it requires minimal privilege escalation and can persist indefinitely until the malicious content is removed from the database.
The operational impact of CVE-2024-1328 extends beyond simple script execution, as it can enable attackers to manipulate the user interface, redirect traffic to malicious domains, or establish persistent backdoors within the WordPress environment. The vulnerability's persistence stems from the stored nature of the XSS, meaning that once injected, the malicious scripts remain active until manually removed from the database. This characteristic makes the vulnerability particularly dangerous for organizations relying on Newsletter2Go for email marketing automation, as compromised subscriber accounts could lead to unauthorized content distribution or data exfiltration. The attack surface is further expanded by the fact that the vulnerability affects the plugin's core functionality, potentially allowing attackers to bypass standard security controls that might be in place for other WordPress components.
Security mitigations for this vulnerability should prioritize immediate patching of the Newsletter2Go plugin to version 4.0.15 or later, where the input sanitization and output escaping mechanisms have been properly implemented. Organizations should also consider implementing additional security layers such as web application firewalls to monitor for suspicious parameter inputs and content filtering to prevent unauthorized script injection. The remediation process should include comprehensive database scanning to identify any existing malicious content that may have been injected prior to patching. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as T1546.003 (Create or Modify System Process) and T1059.001 (Command and Scripting Interpreter) as attackers could potentially leverage the stored XSS to establish persistent access or execute additional malicious payloads. Regular security audits of WordPress plugins and their configurations should be implemented to identify similar vulnerabilities in other third-party components, as the underlying issue of insufficient input validation represents a common pattern in web application security flaws that require systematic prevention approaches rather than reactive patching.