CVE-2025-9889 in ContentMX Content Publisher Plugin
Summary
by MITRE • 10/03/2025
The ContentMX Content Publisher plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0.6. This is due to missing or incorrect nonce validation on the cmx_activate_connection function. This makes it possible for unauthenticated attackers to bind their own ContentMX connection via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 10/03/2025
The ContentMX Content Publisher plugin for WordPress presents a critical cross-site request forgery vulnerability that affects all versions through 1.0.6, representing a significant security risk for WordPress installations. This vulnerability stems from inadequate validation mechanisms within the cmx_activate_connection function, which fails to properly verify nonce values that should serve as cryptographic tokens to ensure legitimate user actions. The flaw allows unauthenticated attackers to exploit the plugin's functionality by crafting malicious requests that can establish unauthorized ContentMX connections on vulnerable sites.
The technical implementation of this vulnerability demonstrates a fundamental flaw in the plugin's security architecture where nonce validation is either completely absent or improperly implemented, creating an attack surface that enables attackers to manipulate the plugin's connection activation process. The cmx_activate_connection function lacks proper verification of the cryptographic nonce parameter that should be generated and validated during legitimate user interactions, allowing malicious actors to forge requests that appear authentic to the WordPress system.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with persistent access to ContentMX services through compromised WordPress installations. Site administrators who are tricked into clicking malicious links or visiting compromised pages can unknowingly establish unauthorized connections that persist until manually removed, potentially exposing sensitive data or enabling further attacks against the connected ContentMX services. The vulnerability's exploitation requires social engineering elements such as phishing campaigns or malicious link delivery, making it particularly dangerous in environments where administrators frequently interact with external content.
This vulnerability aligns with CWE-352, which specifically addresses cross-site request forgery conditions in web applications, and can be mapped to ATT&CK technique T1078.004 for valid accounts, as successful exploitation effectively grants attackers unauthorized access to ContentMX services through compromised WordPress administrator sessions. The attack vector relies on the principle of user trust and the assumption that legitimate requests from authenticated users are safe to process without additional verification.
Organizations should immediately update to the latest plugin version where this vulnerability has been addressed through proper nonce implementation and validation. Security teams must implement additional monitoring for unusual connection activation patterns within WordPress installations and consider network-level protections such as web application firewalls that can detect and block suspicious request patterns targeting known vulnerable endpoints. The recommended mitigation strategy includes ensuring all WordPress plugins maintain proper authentication verification mechanisms and implementing regular security audits of plugin code to identify similar validation weaknesses that could enable similar exploitation vectors.