CVE-2025-23623 identifies a reflected Cross-site Scripting (XSS) vulnerability in the Mahesh Bisen Contact Form 7 – CCAvenue Add-on plugin for WordPress, specifically affecting versions up to and including 1.0. This vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, allowing malicious scripts to be injected and reflected back to users. Reflected XSS occurs when an attacker crafts a URL or form submission containing malicious JavaScript code that is not properly sanitized by the plugin before being included in the HTTP response. When a victim clicks on such a crafted link or submits malicious data, the injected script executes in the victim’s browser context, potentially leading to session hijacking, cookie theft, or unauthorized actions performed on behalf of the user. The plugin in question integrates Contact Form 7 with the CCAvenue payment gateway, a popular payment processor in India and other regions, making it a critical component in e-commerce and business websites. Although no public exploits have been reported yet, the vulnerability is publicly disclosed and could be targeted by attackers. The lack of a CVSS score indicates that the vulnerability is newly published and not yet fully assessed, but the nature of reflected XSS vulnerabilities typically allows for straightforward exploitation without authentication, increasing risk. The vulnerability affects a widely used content management system plugin, increasing the potential attack surface globally. The vulnerability was assigned and published by Patchstack on January 16, 2025, and no patches or fixes are currently linked, indicating that users must be vigilant and implement interim mitigations.

The primary impact of this vulnerability is the compromise of confidentiality and integrity for users interacting with affected websites. Attackers exploiting the reflected XSS can execute arbitrary JavaScript in the context of the victim’s browser, leading to session hijacking, theft of authentication tokens, defacement of web pages, or redirection to malicious sites. This can result in unauthorized access to user accounts, leakage of sensitive information, and damage to the reputation of affected organizations. Since the plugin integrates with the CCAvenue payment gateway, exploitation could undermine trust in payment processing, potentially leading to financial fraud or disruption of e-commerce operations. The vulnerability does not directly affect availability but could indirectly cause denial of service if attackers deface or disrupt the user experience. Organizations worldwide using this plugin on WordPress sites, especially those processing payments or handling sensitive customer data, face increased risk. The ease of exploitation without authentication and the broad deployment of WordPress and Contact Form 7 plugins amplify the potential impact.

1. Monitor for official patches or updates from the plugin developer and apply them immediately once available. 2. Until a patch is released, implement strict input validation and output encoding on all user-supplied data within the Contact Form 7 – CCAvenue Add-on to neutralize potentially malicious scripts. 3. Deploy a Web Application Firewall (WAF) with rules specifically designed to detect and block reflected XSS payloads targeting this plugin. 4. Educate users and administrators about the risks of clicking on suspicious links and encourage the use of security awareness training. 5. Regularly audit and review web application logs for unusual or suspicious requests that may indicate attempted exploitation. 6. Consider temporarily disabling or replacing the vulnerable plugin with alternative secure solutions if immediate patching is not feasible. 7. Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 8. Ensure that all WordPress core, themes, and plugins are kept up to date to reduce the overall attack surface.