BaseFortify

Executive Summary

CVE-2026-57741 is a Cross-site Scripting (XSS) vulnerability in the AcyMailing SMTP Newsletter WordPress plugin, affecting versions up to 10.11.0.

This vulnerability allows attackers to inject malicious scripts into web pages generated by the plugin.

Exploitation requires a privileged user to perform an action such as clicking a malicious link or submitting a form.

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Impact Analysis

If exploited, this vulnerability could allow attackers to execute malicious scripts on your website.

• Redirect visitors to malicious websites.
• Display unwanted advertisements.
• Deliver other harmful payloads to site visitors.

Such attacks can compromise user trust, damage your website's reputation, and potentially lead to further security breaches.

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Detection Guidance

This vulnerability involves stored Cross Site Scripting (XSS) in the AcyMailing SMTP Newsletter plugin, which can be exploited by injecting malicious scripts that execute when a user accesses the affected web pages.

Detection typically involves monitoring for unusual or suspicious script injections in web pages generated by the plugin, especially inputs that are not properly neutralized.

Since exploitation requires a privileged user action such as clicking a malicious link or submitting a form, network detection can include monitoring HTTP requests for suspicious payloads or unusual POST requests targeting the plugin's input fields.

Specific commands are not provided in the available resources, but general approaches include:

• Using web application scanners or security tools to scan for XSS vulnerabilities in the plugin's pages.
• Reviewing web server logs for suspicious input patterns or script tags in user-submitted content.
• Employing intrusion detection systems (IDS) or web application firewalls (WAF) with rules to detect and block XSS payloads.

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Mitigation Strategies

The immediate recommended step is to update the AcyMailing SMTP Newsletter plugin to version 10.11.1 or later, where this vulnerability has been fixed.

Until the update can be applied, it is advised to implement mitigation rules provided by Patchstack to block attacks targeting this vulnerability.

Additionally, restricting privileged user actions and educating users about the risks of clicking suspicious links or submitting untrusted forms can help reduce exploitation risk.

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