CVE-2023-3962 in Winters Plugin
Summary
by MITRE • 10/25/2023
The Winters theme for WordPress is vulnerable to Reflected Cross-Site Scripting via prototype pollution in versions up to, and including, 1.4.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 04/10/2026
The Winters theme for WordPress represents a significant security vulnerability classified as CVE-2023-3962, which exposes users to reflected cross-site scripting attacks through prototype pollution mechanisms. This vulnerability affects versions up to and including 1.4.3, making it a critical concern for WordPress installations that utilize this theme. The flaw stems from inadequate input sanitization and output escaping practices within the theme's codebase, creating exploitable entry points for malicious actors seeking to compromise user sessions and execute unauthorized scripts.
The technical exploitation of this vulnerability occurs through prototype pollution techniques that manipulate JavaScript object prototypes, allowing attackers to inject malicious code that gets executed when users interact with compromised pages. The reflected nature of the XSS attack means that malicious scripts are injected into web pages that are then reflected back to users, making the attack vector particularly insidious as it can be delivered through various means including malicious links or compromised content. This vulnerability specifically targets the theme's handling of user inputs and fails to properly sanitize or escape data before rendering it in web pages, creating persistent attack surfaces.
The operational impact of CVE-2023-3962 extends beyond simple script injection, potentially enabling attackers to perform session hijacking, deface websites, steal user credentials, or redirect victims to malicious sites. Since the vulnerability affects unauthenticated attackers, it presents an elevated risk as no prior access or credentials are required to exploit the flaw. The attack requires only social engineering to trick users into clicking malicious links, making it particularly dangerous in environments where users may encounter compromised content or links in emails, forums, or other web interactions. This vulnerability directly aligns with CWE-79 which describes cross-site scripting flaws, and represents a specific implementation weakness in the theme's data handling processes.
Mitigation strategies for this vulnerability require immediate updates to the Winters theme to versions that address the prototype pollution and XSS issues. Users should ensure their WordPress installations are running the latest theme versions that include proper input validation and output escaping mechanisms. Security best practices recommend implementing Content Security Policy headers, regular security audits of themes and plugins, and maintaining updated security monitoring systems. Organizations should also consider implementing web application firewalls and user education programs to reduce the risk of successful exploitation through social engineering attacks. The vulnerability demonstrates the critical importance of proper input sanitization and output escaping as outlined in OWASP Top Ten security principles, particularly focusing on preventing XSS attacks through robust data validation and encoding mechanisms.