CVE-2026-57394 in Newsletters Plugin
Summary
by MITRE • 07/13/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Tribulant Software Newsletters newsletters-lite allows Reflected XSS.This issue affects Newsletters: from n/a through <= 4.14.
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Analysis
by VulDB Data Team • 07/13/2026
This cross-site scripting vulnerability resides within the newsletters-lite component of Tribulant Software Newsletters, representing a classic reflected xss flaw that enables attackers to inject malicious scripts into web pages viewed by unsuspecting users. The vulnerability stems from inadequate input sanitization during web page generation processes where user-supplied data is not properly neutralized before being rendered back to clients. This weakness allows an attacker to craft malicious payloads that get executed in the victim's browser context, potentially leading to session hijacking, credential theft, or redirection to malicious sites.
The technical implementation of this flaw occurs when the application fails to validate and sanitize user input parameters that are subsequently reflected back in the HTTP response without proper encoding or escaping mechanisms. According to CWE-79, this vulnerability falls under the category of Cross-Site Scripting where input data is not properly neutralized before being incorporated into dynamically generated web content. The reflected nature indicates that the malicious script is reflected off the web server, typically through url parameters, form fields, or other user-controllable inputs that are processed and returned in the response without adequate sanitization.
The operational impact of this vulnerability extends beyond simple script execution as it creates a vector for more sophisticated attacks within the context of the affected software environment. An attacker could exploit this weakness to steal administrative credentials, manipulate newsletter content, redirect users to phishing sites, or establish persistent malicious presence within the application interface. The specific version range from n/a through 4.14 indicates that all versions within this release series are potentially vulnerable, suggesting that the developers may have introduced or failed to address this security flaw during the development lifecycle.
From an attack perspective, this vulnerability aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments and T1071.001 for application layer protocol usage. The reflected nature makes this particularly dangerous as it requires minimal user interaction beyond visiting a maliciously crafted link, making it suitable for social engineering campaigns. Security professionals should consider implementing content security policies, input validation frameworks, and regular security assessments to identify similar vulnerabilities across the entire software stack.
Mitigation strategies should include immediate patching of affected versions, implementation of proper input sanitization routines that escape or encode user-supplied data before rendering, deployment of web application firewalls with xss detection capabilities, and comprehensive security training for developers regarding secure coding practices. Organizations should also establish robust vulnerability management processes that include regular penetration testing and code reviews focused on input validation and output encoding to prevent similar issues from emerging in future releases. The vulnerability demonstrates the critical importance of maintaining up-to-date security practices throughout the software development lifecycle as outlined in OWASP Top Ten and NIST cybersecurity frameworks.