CVE-2026-57416 in Email Marketing Plugin
Summary
by MITRE • 07/13/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in SiteGround SiteGround Email Marketing siteground-email-marketing allows Stored XSS.This issue affects SiteGround Email Marketing: from n/a through <= 1.7.5.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 07/13/2026
This cross-site scripting vulnerability represents a critical security flaw in the SiteGround Email Marketing plugin that enables attackers to inject malicious scripts into web pages viewed by other users. The vulnerability falls under the CWE-79 category for cross-site scripting and specifically manifests as a stored XSS attack vector where malicious payloads persist in the application's database or storage systems. The affected version range indicates that all versions up to and including 1.7.5 contain this flaw, making it a widespread issue affecting numerous SiteGround users who rely on this email marketing solution.
The technical implementation of this vulnerability occurs during web page generation processes where user input is not properly sanitized or escaped before being rendered in HTML output contexts. When legitimate users interact with the email marketing interface and submit content containing malicious script tags, these inputs are stored without adequate validation mechanisms. Subsequently, when other users access pages that display this stored data, the embedded scripts execute within their browser context, potentially compromising user sessions, stealing sensitive information, or redirecting users to malicious websites.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with persistent access to victim environments through the email marketing platform. Attackers can leverage this weakness to hijack user sessions, perform actions on behalf of authenticated users, steal cookies containing session tokens, or inject phishing content that appears legitimate within the SiteGround interface. This stored nature of the vulnerability means that the attack remains active even after the initial injection point, allowing for prolonged exploitation and potentially enabling more sophisticated attacks such as credential theft or privilege escalation within the affected WordPress environment.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's data handling pipeline. The recommended approach involves sanitizing all user-supplied data using appropriate escaping functions before rendering any content in HTML contexts, while also implementing proper Content Security Policy headers to limit script execution capabilities. Additionally, maintaining up-to-date software versions is essential as newer releases typically contain patched implementations of input validation routines and improved security measures. Organizations should also consider implementing web application firewalls and regular security scanning procedures to detect and prevent exploitation attempts targeting such vulnerabilities. This issue aligns with ATT&CK technique T1566 for initial access through malicious content and demonstrates the importance of proper input sanitization in preventing persistent security flaws within web applications.
The vulnerability represents a significant risk to SiteGround's customer base as email marketing platforms often contain sensitive business information and user data. The stored nature of the XSS attack means that once exploited, the malicious code continues to execute against all users who encounter the compromised content, potentially affecting thousands of users across multiple organizations. Security practitioners should prioritize patching this vulnerability immediately while also conducting thorough security assessments of other plugins and themes within the WordPress ecosystem to identify similar weaknesses in input handling mechanisms.