CVE-2026-116863 in Newsletters Plugin
Summary
by MITRE • 10/27/2026
Cross-Site Request Forgery (CSRF) vulnerability in Tribulant Software Newsletters newsletters-lite allows Cross Site Request Forgery.This issue affects Newsletters: from n/a through 4.18.2.
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Analysis
by VulDB Data Team • 10/27/2026
The identified security flaw represents a classic Cross-Site Request Forgery, or CSRF, vulnerability within the news lite plugin for WordPress developed by Tribulant Software. This type of attack exploits the trust that a web application has in the user's browser to execute unintended commands on behalf of an authenticated user without their knowledge or consent. The vulnerability exists because the affected software versions, ranging from unspecified early releases through version 4.18.2, fail to implement adequate anti-CSRF protections such as unique per-session tokens or strict origin validation for state-changing requests. In a typical web application architecture, authentication is often maintained via session cookies that are automatically sent by the browser with every request to the domain. If an endpoint responsible for modifying data does not verify that the request originated from a legitimate page within the same site and includes a secret token known only to the server and the specific user's current session, it becomes susceptible to forgery attacks.
From a technical perspective, this vulnerability allows an attacker to craft malicious HTML or JavaScript content hosted on a different domain. When an administrator or any authenticated user with sufficient privileges visits this malicious page while still logged into the WordPress site running the vulnerable newsletter plugin, their browser will automatically include valid session cookies in the request sent to the target application. Because the server does not properly validate the source of the request beyond checking for these standard authentication tokens, it processes the forged command as if it were a legitimate action initiated by the user. This could allow an attacker to perform actions such as creating new administrator accounts, modifying newsletter configurations, sending unsolicited emails to subscribers, or deleting critical data, depending on what operations are exposed through vulnerable endpoints in the plugin's codebase.
The operational impact of this vulnerability is significant due to the high privilege levels typically associated with WordPress administrators and content managers who manage newsletters. An successful exploitation could lead to a complete compromise of the website's integrity and confidentiality. Attackers might use the newsletter functionality to distribute phishing links or malware to subscribers, thereby damaging the reputation of the organization hosting the site. Furthermore, if administrative credentials are created by an attacker through this vector, it provides persistent access that can be used for further lateral movement within the network infrastructure. The lack of proper request validation means that even sophisticated users may not realize their actions have been hijacked until malicious changes or communications appear on the live system.
To mitigate this risk, immediate action is required to update the Tribulant Software Newsletters plugin to a version later than 4.18.2 where these security controls have presumably been addressed by the vendor. In addition to updating software, administrators should ensure that their web server configuration enforces strict Content Security Policy headers and SameSite cookie attributes to provide additional layers of defense against CSRF attacks. Implementing Web Application Firewall rules can also help detect and block suspicious request patterns associated with forgery attempts. From a development standpoint, all state-changing endpoints must be fortified by implementing synchronizer token patterns where each form submission requires a unique, unpredictable value generated server-side and validated upon receipt. This ensures that requests are genuinely initiated by the authenticated user through the intended interface rather than being forged from external sources.
This vulnerability aligns with Common Weakness Enumeration category CWE-352, which specifically defines Cross-Site Request Forgery as a weakness where an attacker causes a victim to submit a request without their consent due to insufficient verification of intent. In terms of offensive security frameworks, this flaw facilitates the MITRE ATT&CK technique T1076, known as Remote File Inclusion or in this context more accurately mapped to T1534 which involves Internal Spearphishing if used for social engineering, but technically it falls under exploitation techniques that leverage trusted relationships. The absence of proper anti-forgery tokens is a fundamental design flaw that undermines the principle of least privilege and secure by default configurations recommended in modern web application security standards such as OWASP Top 10. Organizations must treat this not merely as a configuration error but as a critical architectural deficiency requiring immediate remediation to prevent unauthorized state changes within their WordPress environments.