CVE-2025-58921 identifies a reflected Cross-site Scripting (XSS) vulnerability in the Arevico WP Tactical Popup WordPress plugin, affecting versions up to and including 1.1. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code that is reflected back to users without adequate sanitization or encoding. When a victim visits a crafted URL or interacts with a malicious popup, the injected script executes in their browser context, potentially enabling theft of authentication cookies, session tokens, or other sensitive information. It could also allow attackers to perform actions on behalf of the user or redirect them to malicious sites. The vulnerability is classified as reflected XSS, which typically requires the victim to click a malicious link or visit a compromised page. No CVSS score has been assigned yet, and no public exploits are known at this time. The plugin is used to create tactical popups on WordPress sites, which are widely deployed across various industries including e-commerce, media, and corporate websites. The lack of a patch link indicates that a fix may not yet be available, so organizations should monitor for updates from Arevico or consider temporary mitigations such as disabling the plugin or implementing web application firewall (WAF) rules to detect and block suspicious input patterns.

For European organizations, this vulnerability poses a significant risk to confidentiality and integrity of user sessions and data. Exploitation could lead to account hijacking, unauthorized actions performed under the guise of legitimate users, and potential distribution of malware through injected scripts. Organizations relying on WP Tactical Popup for customer engagement or internal communications may face reputational damage and regulatory consequences if user data is compromised. The reflected XSS nature means that social engineering or phishing campaigns could be used to lure users into triggering the exploit. Given the widespread use of WordPress in Europe, especially in countries with large digital economies such as Germany, France, and the UK, the potential attack surface is considerable. Additionally, sectors with strict data protection requirements under GDPR could face compliance risks if this vulnerability is exploited to leak personal data.

Organizations should immediately inventory their WordPress installations to identify the presence of the WP Tactical Popup plugin and its version. Until an official patch is released by Arevico, consider disabling or uninstalling the plugin to eliminate the attack vector. If the plugin is essential, implement strict input validation and output encoding on all user-supplied data processed by the plugin, possibly via custom code or third-party security plugins. Deploy a Web Application Firewall (WAF) with rules tailored to detect and block reflected XSS payloads targeting the plugin's endpoints. Educate users and administrators on the risks of clicking suspicious links and encourage the use of security headers such as Content Security Policy (CSP) to reduce the impact of XSS attacks. Monitor security advisories from Arevico and Patchstack for updates or patches and apply them promptly. Conduct regular security testing, including automated scanning and manual penetration testing focused on XSS vulnerabilities in WordPress plugins.