CVE-2025-54721 is a reflected Cross-site Scripting (XSS) vulnerability affecting ThimPress Resca, a WordPress theme or plugin, in versions up to 3.0.2. The vulnerability stems from improper neutralization of input during web page generation, allowing malicious scripts to be injected and executed in the context of a victim's browser. Specifically, user-supplied input is not adequately sanitized or encoded before being included in the HTML output, enabling attackers to craft URLs or inputs that trigger script execution when visited by users. This reflected XSS does not require authentication but does require user interaction, such as clicking a maliciously crafted link. The vulnerability has a CVSS v3.1 base score of 7.1, reflecting its high severity due to network attack vector, low attack complexity, no privileges required, requirement for user interaction, and impacts on confidentiality, integrity, and availability. Exploitation could lead to session hijacking, theft of sensitive information, defacement of web pages, or redirection to malicious sites. Although no known exploits are reported in the wild, the vulnerability poses a significant risk to websites using the affected Resca versions. The issue was reserved in July 2025 and published in November 2025, indicating recent discovery and disclosure. The lack of available patches at the time of reporting necessitates immediate mitigation efforts. The reflected nature means attackers must trick users into visiting malicious URLs, often via phishing or social engineering. The vulnerability is particularly relevant for organizations relying on WordPress with the Resca theme, which is popular among small to medium-sized businesses and creative agencies. The vulnerability's impact is compounded by the widespread use of WordPress in Europe and the criticality of maintaining website integrity and user trust.

For European organizations, this vulnerability poses a significant risk to web-facing assets using the ThimPress Resca theme or plugin. Successful exploitation can lead to unauthorized access to user sessions, theft of credentials, and exposure of sensitive customer data, undermining GDPR compliance and potentially resulting in regulatory penalties. The integrity of websites can be compromised, damaging brand reputation and customer trust. Availability may also be affected if attackers use the vulnerability to deface sites or redirect traffic to malicious domains. Given the prevalence of WordPress in Europe, especially among SMEs and creative sectors, many organizations could be exposed. Attackers could leverage this vulnerability in targeted phishing campaigns against European users, increasing the risk of broader compromise. The reflected XSS nature means that the attack surface includes any user who can be tricked into clicking a malicious link, expanding the potential victim pool. The impact is heightened in sectors where web presence is critical, such as e-commerce, media, and professional services. Additionally, the vulnerability could be exploited to bypass security controls or deliver secondary payloads, amplifying its threat.

1. Apply patches or updates from ThimPress as soon as they become available to address the vulnerability directly. 2. Implement strict input validation and output encoding on all user-supplied data to prevent script injection, using established libraries or frameworks that handle XSS protection. 3. Deploy a robust Content Security Policy (CSP) to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 4. Use Web Application Firewalls (WAFs) with rules tailored to detect and block reflected XSS attack patterns targeting Resca. 5. Educate users and staff about phishing and social engineering tactics to reduce the likelihood of clicking malicious links. 6. Regularly scan web applications with automated tools to detect XSS vulnerabilities and verify remediation. 7. Monitor web server and application logs for suspicious requests that may indicate attempted exploitation. 8. Consider isolating or sandboxing critical web applications to limit the impact of a successful attack. 9. For organizations unable to patch immediately, temporarily disable or restrict access to vulnerable components if feasible. 10. Collaborate with hosting providers to ensure security best practices and timely updates are enforced.