CVE-2026-14331 in Subscribe2 Plugin
Summary
by MITRE • 08/07/2026
The Subscribe2 WordPress plugin before 10.46 does not properly escape a user-supplied value before reflecting it into a public subscription form, leading to Reflected Cross-Site Scripting that executes in the browser of an unauthenticated visitor who interacts with the form through a crafted link.
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Analysis
by VulDB Data Team • 08/07/2026
The Subscribe2 WordPress plugin vulnerability represents a critical reflected cross-site scripting flaw that exploits improper input sanitization within the subscription form functionality. This weakness affects versions prior to 10.46 and creates a persistent security risk by allowing malicious actors to inject arbitrary JavaScript code into the plugin's user interface. The vulnerability manifests when the plugin fails to properly escape user-supplied values before incorporating them into the HTML output of public subscription forms, creating an attack vector that can be exploited through crafted links delivered to unsuspecting visitors.
The technical implementation of this flaw stems from inadequate output escaping mechanisms within the plugin's form handling code. When users interact with subscription forms, the plugin processes parameters from URL queries or form inputs without sufficient sanitization before rendering them in the browser context. This creates an environment where malicious payloads can be executed in the victim's browser session, particularly when unauthenticated visitors click on specially crafted links that contain malicious script content. The vulnerability operates at the application layer and specifically targets the plugin's user interface components that handle subscription requests.
Operational impact of this vulnerability extends beyond simple script execution as it enables attackers to perform various malicious activities through the compromised browser sessions. Unauthenticated visitors who interact with the vulnerable form become potential vectors for session hijacking, data exfiltration, or redirection to malicious sites. The attack requires minimal sophistication since it can be delivered through standard URL manipulation techniques, making it particularly dangerous in environments where users might click on links from untrusted sources. The reflected nature of the vulnerability means that payloads are executed immediately upon form interaction rather than requiring persistent storage.
The security implications align with CWE-79 which categorizes cross-site scripting vulnerabilities as a fundamental web application weakness. This particular implementation follows ATT&CK technique T1059.007 for command and scripting interpreter, specifically targeting browser-based scripting execution. Mitigation strategies include immediate upgrade to Subscribe2 plugin version 10.46 or later, which implements proper input sanitization and output escaping mechanisms. Additionally, administrators should implement content security policies that restrict script execution within the plugin's context and consider additional web application firewalls to detect and block suspicious parameter injection attempts. Regular security audits of WordPress plugins and maintaining updated security practices are essential for preventing similar vulnerabilities in other components of the web application stack.