CVE-2026-57741 is a stored cross-site scripting vulnerability in AcyMailing SMTP Newsletter affecting versions up to 10.11.0. The issue arises from improper input neutralization during web page generation, which allows attackers to inject and store malicious scripts that execute in the context of users viewing the affected pages. The vulnerability has a CVSS 3.1 base score of 7.1, with network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability. No vendor advisory or patch information is currently available, and no exploits are known in the wild.

Successful exploitation of this stored XSS vulnerability could allow an attacker to execute arbitrary scripts in the context of users accessing the affected AcyMailing SMTP Newsletter web pages. This may lead to information disclosure, session hijacking, or other impacts on confidentiality, integrity, and availability as indicated by the CVSS vector. However, no known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution when interacting with untrusted content in the affected application and consider applying any available temporary mitigations recommended by the vendor once published.